Add Lua function to calculate the number of seconds between dates and use it in assets (#3332)

2026-01-05 11:09:37 -06:00 · 2024-07-11 10:34:06 +02:00
parent e7b6cbb4d6
commit b8e9193bc7
71 changed files with 157 additions and 110 deletions
--- a/data/assets/examples/volume/generated/cartesian.asset
+++ b/data/assets/examples/volume/generated/cartesian.asset
@@ -25,8 +25,8 @@ local Volume = {
    MinValue = 0,
    MaxValue = 1,
    GridType = "Cartesian",
-    SecondsBefore = 50 * 365 * 24 * 60 * 60, -- 50 years before
-    SecondsAfter = 50 * 365 * 24 * 60 * 60 -- 50 years after
+    SecondsBefore = 50 * openspace.time.secondsPerYear(), -- 50 years before
+    SecondsAfter = 50 * openspace.time.secondsPerYear() -- 50 years after
  },
  GUI = {
    Path = "/Examples"
--- a/data/assets/examples/volume/generated/cartesiansequence.asset
+++ b/data/assets/examples/volume/generated/cartesiansequence.asset
@@ -19,8 +19,8 @@ local Volume = {
    MinValue = 0,
    MaxValue = 1,
    GridType = "Cartesian",
-    SecondsBefore = 50 * 365 * 24 * 60 * 60, -- 50 years before
-    SecondsAfter = 50 * 365 * 24 * 60 * 60 -- 50 years after
+    SecondsBefore = 50 * openspace.time.secondsPerYear(), -- 50 years before
+    SecondsAfter = 50 * openspace.time.secondsPerYear() -- 50 years after
  },
  GUI = {
    Path = "/Examples"
--- a/data/assets/examples/volume/generated/spherical.asset
+++ b/data/assets/examples/volume/generated/spherical.asset
@@ -25,8 +25,8 @@ local Volume = {
    MinValue = 0,
    MaxValue = 1,
    GridType = "Spherical",
-    SecondsBefore = 50 * 365 * 24 * 60 * 60, -- 50 years before
-    SecondsAfter = 50 * 365 * 24 * 60 * 60 -- 50 years after
+    SecondsBefore = 50 * openspace.time.secondsPerYear(), -- 50 years before
+    SecondsAfter = 50 * openspace.time.secondsPerYear() -- 50 years after
  },
  GUI = {
    Path = "/Examples"
--- a/data/assets/scene/solarsystem/heliosphere/bastille_day/density_volume.asset
+++ b/data/assets/scene/solarsystem/heliosphere/bastille_day/density_volume.asset
@@ -39,8 +39,8 @@ local DensityVolume = {
    TransferFunction = asset.resource("transferfunctions/mas-mhd-r-squared.txt"),
    SourceDirectory = densityDirectory,
    GridType = "Spherical",
-    SecondsBefore = 24 * 60 * 60,
-    SecondsAfter = 24 * 60 * 60,
+    SecondsBefore = openspace.time.secondsPerDay(),
+    SecondsAfter = openspace.time.secondsPerDay(),
    Dimensions = { 100, 100, 128 },
    InvertDataAtZ = true
  },
--- a/data/assets/scene/solarsystem/interstellar/c-2019_q4_borisov.asset
+++ b/data/assets/scene/solarsystem/interstellar/c-2019_q4_borisov.asset
@@ -27,7 +27,7 @@ local C2019Q4BorisovTrail = {
    Color = { 0.9, 0.9, 0.0 },
    StartTime = "2015 JAN 01 00:00:00",
    EndTime = "2050 JAN 01 00:00:00",
-    SampleInterval = 60 * 60 * 24 -- = 86 400 seconds in 1 day
+    SampleInterval = openspace.time.secondsPerDay()
  },
  GUI = {
    Name = "C/2019 Q4 Borisov Trail",
--- a/data/assets/scene/solarsystem/interstellar/oumuamua.asset
+++ b/data/assets/scene/solarsystem/interstellar/oumuamua.asset
@@ -27,8 +27,7 @@ local OumuamuaTrail = {
    Color = { 0.9, 0.9, 0.0 },
    StartTime = "2014 JAN 01 00:00:00",
    EndTime = "2050 JAN 01 00:00:00",
-    SampleInterval = 86400,
-    TimeStampSubsampleFactor = 1
+    SampleInterval = openspace.time.secondsPerDay()
  },
  GUI = {
    Name = "'Oumuamua Trail",
--- a/data/assets/scene/solarsystem/missions/messenger/mercurymagnetosphere.asset
+++ b/data/assets/scene/solarsystem/missions/messenger/mercurymagnetosphere.asset
@@ -42,8 +42,8 @@ local Magnetosphere = {
    StepSize = 0.003,
    Dimensions = { 64, 64, 64 },
    GridType = "Cartesian",
-    SecondsBefore = 24 * 60 * 60 * 365 * 100,
-    SecondsAfter = 24 * 60 * 60 * 365 * 100
+    SecondsBefore = 100 * openspace.time.secondsPerYear(),
+    SecondsAfter = 100 * openspace.time.secondsPerYear()
  },
  GUI = {
    Name = "Mercury Magnetosphere",
--- a/data/assets/scene/solarsystem/missions/pioneer/pioneer10.asset
+++ b/data/assets/scene/solarsystem/missions/pioneer/pioneer10.asset
@@ -32,6 +32,9 @@ local Pioneer10 = {
  }
 }

+local StartTime = "1972 MAR 03 02:04:00"
+local EndTime = "1990 JAN 02 00:00:00"
+
 local Pioneer10Trail = {
  Identifier = "Pioneer_10Trail",
  Parent = sunTransforms.SolarSystemBarycenter.Identifier,
@@ -43,11 +46,12 @@ local Pioneer10Trail = {
      Observer = coreKernels.ID.SolarSystemBarycenter
    },
    Color = { 0.70, 0.50, 0.20 },
-    StartTime = "1972 MAR 03 02:04:00",
-    EndTime = "1990 JAN 02 00:00:00",
+    StartTime = StartTime,
+    EndTime = EndTime,
    EnableFade = false,
-    SampleInterval = 6545 * 2
-    -- 6545 is the number of days between the Start and End time (aka sample every 2d)
+    -- 1 sample every 2d
+    SampleInterval =
+      openspace.time.duration(StartTime, EndTime) / openspace.time.secondsPerYear() * 2
  },
  GUI = {
    Name = "Pioneer 10 Trail (SPICE)",
--- a/data/assets/scene/solarsystem/missions/pioneer/pioneer11.asset
+++ b/data/assets/scene/solarsystem/missions/pioneer/pioneer11.asset
@@ -37,6 +37,9 @@ local Pioneer11 = {
  }
 }

+local StartTime = "1973 APR 06 02:25:00.000"
+local EndTime = "1990 JAN 02 00:00:00.000"
+
 local Pioneer11Trail = {
  Identifier = "Pioneer_11Trail",
  Parent = sunTransforms.SolarSystemBarycenter.Identifier,
@@ -48,11 +51,12 @@ local Pioneer11Trail = {
      Observer = coreKernels.ID.SolarSystemBarycenter
    },
    Color = { 0.70, 0.50, 0.20 },
-    StartTime = "1973 APR 06 02:25:00.000",
-    EndTime = "1990 JAN 02 00:00:00.000",
+    StartTime = StartTime,
+    EndTime = EndTime,
    EnableFade = false,
-    -- 6087 is the number of days between the Start and End time (so sample every 2d)
-    SampleInterval = 6087 * 2
+    -- 1 sample every 2d
+    SampleInterval =
+      openspace.time.duration(StartTime, EndTime) / openspace.time.secondsPerYear() * 2
  },
  GUI = {
    Name = "Pioneer 11 Trail (SPICE)",
--- a/data/assets/scene/solarsystem/missions/voyager/voyager1.asset
+++ b/data/assets/scene/solarsystem/missions/voyager/voyager1.asset
@@ -95,8 +95,9 @@ local VoyagerTrailCruiseEarthJupiter = {
    Color = { 0.70, 0.50, 0.20 },
    StartTime = "1977 SEP 05",
    EndTime = "1979 MAR 04",
-    -- 545 is the number of days between the Start and End time
-    SampleInterval = 545 * 2
+    -- 1 sample every 2d
+    SampleInterval = openspace.time.duration("1977 SEP 05", "1979 MAR 04") /
+                     openspace.time.secondsPerYear() * 2
  },
  Tag = { "voyager1_trail" },
  GUI = {
@@ -145,8 +146,9 @@ local VoyagerTrailCruiseJupiterSaturn = {
    Color = { 0.70, 0.50, 0.20 },
    StartTime = "1979 MAR 09",
    EndTime = "1980 NOV 11",
-    -- 618 is the number of days between the Start and End time
-    SampleInterval = 618 * 2
+    -- 1 sample every 2d
+    SampleInterval = openspace.time.duration("1979 MAR 09", "1980 NOV 11") /
+                     openspace.time.secondsPerYear() * 2
  },
  Tag = { "voyager1_trail" },
  GUI = {
@@ -195,8 +197,10 @@ local VoyagerTrailCruiseSaturnInf = {
    Color = { 0.70, 0.50, 0.20 },
    StartTime = "1980 NOV 16",
    EndTime = "2100 JAN 01",
-    -- 43511 is the number of days between the Start and End time
-    SampleInterval = 43511 * 2
+    -- 1 sample every 2d
+    SampleInterval = openspace.time.duration("1980 NOV 16", "2100 JAN 01") /
+                     openspace.time.secondsPerYear() * 2
+
  },
  Tag = { "voyager1_trail" },
  GUI = {
--- a/data/assets/scene/solarsystem/missions/voyager/voyager2.asset
+++ b/data/assets/scene/solarsystem/missions/voyager/voyager2.asset
@@ -98,8 +98,9 @@ local VoyagerTrailCruiseEarthJupiter = {
    Color = { 0.70, 0.50, 0.20 },
    StartTime = "1977-AUG-20 16:07:06.535",
    EndTime = "1979 JUL 06",
-    -- 669 is the number of days between the Start and End time
-    SampleInterval = 669 * 2
+    -- 1 sample every 2d
+    SampleInterval = openspace.time.duration("1977-AUG-20 16:07:06.535", "1979 JUL 06") /
+                     openspace.time.secondsPerYear() * 2
  },
  Tag = { "voyager2_trail" },
  GUI = {
@@ -148,8 +149,9 @@ local VoyagerTrailCruiseJupiterSaturn = {
    Color = { 0.70, 0.50, 0.20 },
    StartTime = "1979 JUL 15",
    EndTime = "1981 AUG 23",
-    -- 770 is the number of days between the Start and End time
-    SampleInterval = 770 * 2
+    -- 1 sample every 2d
+    SampleInterval = openspace.time.duration("1979 JUL 15", "1981 AUG 23") /
+                     openspace.time.secondsPerYear() * 2
  },
  Tag = { "voyager2_trail" },
  GUI = {
@@ -198,8 +200,9 @@ local VoyagerTrailCruiseSaturnUranus = {
    Color = { 0.70, 0.50, 0.20 },
    StartTime = "1981 AUG 30",
    EndTime = "1986 JAN 22",
-    -- 1971 is the number of days between the Start and End time
-    SampleInterval = 1971 * 2
+    -- 1 sample every 2d
+    SampleInterval = openspace.time.duration("1981 AUG 30", "1986 JAN 22") /
+                     openspace.time.secondsPerYear() * 2
  },
  Tag = { "voyager2_trail" },
  GUI = {
@@ -248,8 +251,9 @@ local VoyagerTrailCruiseUranusNeptune = {
    Color = { 0.70, 0.50, 0.20 },
    StartTime = "1986 JAN 27",
    EndTime = "1989 AUG 24",
-    -- 1305 is the number of days between the Start and End time
-    SampleInterval = 1305 * 2
+    -- 1 sample every 2d
+    SampleInterval = openspace.time.duration("1986 JAN 27", "1989 AUG 24") /
+                     openspace.time.secondsPerYear() * 2
  },
  Tag = { "voyager2_trail" },
  GUI = {
@@ -298,8 +302,9 @@ local VoyagerTrailCruiseNeptuneInf = {
    Color = { 0.70, 0.50, 0.20 },
    StartTime = "1989 AUG 26",
    EndTime = "2100 JAN 01",
-    -- 40306 is the number of days between the Start and End time
-    SampleInterval = 40306 * 2
+    -- 1 sample every 2d
+    SampleInterval = openspace.time.duration("1989 AUG 26", "2100 JAN 01") /
+                     openspace.time.secondsPerYear() * 2
  },
  Tag = { "voyager2_trail" },
  GUI = {
--- a/data/assets/scene/solarsystem/missions/voyagerpioneer/voyager1_2__pioneer10_11.asset
+++ b/data/assets/scene/solarsystem/missions/voyagerpioneer/voyager1_2__pioneer10_11.asset
@@ -13,8 +13,6 @@ local pioneer_horizons = asset.resource({
 })


-local SampleInterval = 24 * 60 * 60
-
 local Voyager1 = {
  Identifier = "Voyager1",
  Parent = "SolarSystemBarycenter",
@@ -34,8 +32,7 @@ local Voyager1 = {
    Fade = 5.0,
    StartTime = "1977 SEP 06 00:00:00",
    EndTime = "2030 JAN 01 00:00:00",
-    SampleInterval = SampleInterval,
-    TimeStampSubsampleFactor = 1
+    SampleInterval = openspace.time.secondsPerDay()
  },
  GUI = {
    Name = "Voyager 1 Trail",
@@ -64,8 +61,7 @@ local Voyager2 = {
    Fade = 5.0,
    StartTime = "1977 AUG 21 00:00:00",
    EndTime = "2030 JAN 01 00:00:00",
-    SampleInterval = SampleInterval,
-    TimeStampSubsampleFactor = 1
+    SampleInterval = openspace.time.secondsPerDay()
  },
  GUI = {
    Name = "Voyager 2 Trail",
@@ -94,8 +90,7 @@ local Pioneer10 = {
    Fade = 5.0,
    StartTime = "1972 MAR 04 00:00:00",
    EndTime = "2030 JAN 01 00:00:00",
-    SampleInterval = SampleInterval,
-    TimeStampSubsampleFactor = 1
+    SampleInterval = openspace.time.secondsPerDay()
  },
  GUI = {
    Name = "Pioneer 10 Trail",
@@ -124,8 +119,7 @@ local Pioneer11 ={
    Fade = 5.0,
    StartTime = "1973 APR 07 00:00:00",
    EndTime = "2030 JAN 01 00:00:00",
-    SampleInterval = SampleInterval,
-    TimeStampSubsampleFactor = 1
+    SampleInterval = openspace.time.secondsPerDay()
  },
  GUI = {
    Name = "Pioneer 11 Trail",
--- a/data/assets/scene/solarsystem/planets/earth/satellites/communications/amateur.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/communications/amateur.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_amateur_radio",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?GROUP=amateur&FORMAT=kvn",
  Filename = "amateur.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/communications/experimental.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/communications/experimental.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_x-comm",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?GROUP=x-comm&FORMAT=kvn",
  Filename = "x-comm.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/communications/geostationary.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/communications/geostationary.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_geo",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?GROUP=geo&FORMAT=kvn",
  Filename = "geo.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/communications/globalstar.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/communications/globalstar.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_globalstar",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?GROUP=globalstar&FORMAT=kvn",
  Filename = "globalstar.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/communications/gorizont.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/communications/gorizont.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_gorizont",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?GROUP=gorizont&FORMAT=kvn",
  Filename = "gorizont.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/communications/intelsat.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/communications/intelsat.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_intelsat",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?GROUP=intelsat&FORMAT=kvn",
  Filename = "intelsat.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/communications/iridium.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/communications/iridium.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_iridium",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?GROUP=iridium&FORMAT=kvn",
  Filename = "iridium.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/communications/iridium_next.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/communications/iridium_next.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_iridium-NEXT",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?GROUP=iridium-NEXT&FORMAT=kvn",
  Filename = "iridium-NEXT.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/communications/molniya.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/communications/molniya.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_molniya",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?GROUP=molniya&FORMAT=kvn",
  Filename = "molniya.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/communications/orbcomm.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/communications/orbcomm.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_orbcomm",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?GROUP=orbcomm&FORMAT=kvn",
  Filename = "orbcomm.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/communications/other_comm.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/communications/other_comm.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_other-comm",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?GROUP=other-comm&FORMAT=kvn",
  Filename = "other-comm.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/communications/raduga.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/communications/raduga.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_raduga",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?GROUP=raduga&FORMAT=kvn",
  Filename = "raduga.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/communications/ses.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/communications/ses.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_ses",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?GROUP=ses&FORMAT=kvn",
  Filename = "ses.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/communications/starlink.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/communications/starlink.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_starlink",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?GROUP=starlink&FORMAT=kvn",
  Filename = "starlink.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/debris/debris_asat.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/debris/debris_asat.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_2019-006",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?INTDES=2019-006&FORMAT=kvn",
  Filename = "2019-006.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/debris/debris_breezem.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/debris/debris_breezem.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_2012-044",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?INTDES=2012-044&FORMAT=kvn",
  Filename = "2012-044.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/debris/debris_fengyun.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/debris/debris_fengyun.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_1999-025",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?INTDES=1999-025&FORMAT=kvn",
  Filename = "1999-025.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/debris/debris_iridium33.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/debris/debris_iridium33.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_iridium-33-debris",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?GROUP=iridium-33-debris&FORMAT=kvn",
  Filename = "iridium-33-debris.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/debris/debris_kosmos2251.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/debris/debris_kosmos2251.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_cosmos-2251-debris",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?GROUP=cosmos-2251-debris&FORMAT=kvn",
  Filename = "cosmos-2251-debris.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/debris/volume/cartesian_volume.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/debris/volume/cartesian_volume.asset
@@ -24,8 +24,8 @@ local DebrisVolumeCartesian = {
    MinValue = 0,
    MaxValue = 1,
    GridType = "Cartesian",
-    SecondsBefore = 50 * 365 * 24 * 60 * 60,
-    SecondsAfter = 50 * 365 * 24 * 60 * 60
+    SecondsBefore = 50 * openspace.time.secondsPerYear(),
+    SecondsAfter = 50 * openspace.time.secondsPerYear()
  },
  GUI = {
    Name = "Debris Volume - Cartesian",
--- a/data/assets/scene/solarsystem/planets/earth/satellites/debris/volume/spherical_volume.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/debris/volume/spherical_volume.asset
@@ -24,8 +24,8 @@ local DebrisVolumeSpherical = {
    MinValue = 0,
    MaxValue = 1,
    GridType = "Spherical",
-    SecondsBefore = 50 * 365 * 24 * 60 * 60,
-    SecondsAfter = 50 * 365 * 24 * 60 * 60
+    SecondsBefore = 50 * openspace.time.secondsPerYear(),
+    SecondsAfter = 50 * openspace.time.secondsPerYear()
  },
  GUI = {
    Name = "DebrisVolume - Spherical",
--- a/data/assets/scene/solarsystem/planets/earth/satellites/misc/active.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/misc/active.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_active",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?GROUP=active&FORMAT=kvn",
  Filename = "active.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/misc/brightest.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/misc/brightest.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_visual",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?GROUP=visual&FORMAT=kvn",
  Filename = "visual.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/misc/cubesats.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/misc/cubesats.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_cubesat",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?GROUP=cubesat&FORMAT=kvn",
  Filename = "cubesat.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/misc/hubble_trail.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/misc/hubble_trail.asset
@@ -9,7 +9,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_hst",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?CATNR=20580&FORMAT=kvn",
  Filename = "hst.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/misc/iss.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/misc/iss.asset
@@ -24,7 +24,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_iss",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?CATNR=25544&FORMAT=kvn",
  Filename = "ISS.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })

 local tle = asset.resource({
@@ -33,7 +33,7 @@ local tle = asset.resource({
  Identifier = "satellite_tle_data_iss",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?CATNR=25544&FORMAT=tle",
  Filename = "ISS.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/misc/military.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/misc/military.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_military",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?GROUP=military&FORMAT=kvn",
  Filename = "military.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/misc/other.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/misc/other.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_other",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?GROUP=other&FORMAT=kvn",
  Filename = "other.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/misc/radar.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/misc/radar.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_radar",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?GROUP=radar&FORMAT=kvn",
  Filename = "radar.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/misc/spacestations.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/misc/spacestations.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_stations",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?GROUP=stations&FORMAT=kvn",
  Filename = "stations.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/misc/tiangong.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/misc/tiangong.asset
@@ -16,7 +16,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_tiangong",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?CATNR=48274&FORMAT=kvn",
  Filename = "Tiangong.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/misc/tle-new.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/misc/tle-new.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_tle-new",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?GROUP=last-30-days&FORMAT=kvn",
  Filename = "tle-new.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/navigation/beidou.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/navigation/beidou.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_beidou",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?GROUP=beidou&FORMAT=kvn",
  Filename = "beidou.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/navigation/galileo.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/navigation/galileo.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_galileo",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?GROUP=galileo&FORMAT=kvn",
  Filename = "galileo.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/navigation/glosnass.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/navigation/glosnass.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_glo-ops",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?GROUP=glo-ops&FORMAT=kvn",
  Filename = "glo-ops.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/navigation/gps.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/navigation/gps.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_gps-ops",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?GROUP=gps-ops&FORMAT=kvn",
  Filename = "gps-ops.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/navigation/musson.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/navigation/musson.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_musson",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?GROUP=musson&FORMAT=kvn",
  Filename = "musson.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/navigation/nnss.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/navigation/nnss.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_nnss",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?GROUP=nnss&FORMAT=kvn",
  Filename = "nnss.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/navigation/sbas.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/navigation/sbas.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_sbas",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?GROUP=sbas&FORMAT=kvn",
  Filename = "sbas.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/science/education.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/science/education.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_education",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?GROUP=education&FORMAT=kvn",
  Filename = "education.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/science/engineering.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/science/engineering.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_engineering",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?GROUP=engineering&FORMAT=kvn",
  Filename = "engineering.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/science/geodetic.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/science/geodetic.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_geodetic",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?GROUP=geodetic&FORMAT=kvn",
  Filename = "geodetic.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/science/spaceearth.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/science/spaceearth.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_science",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?GROUP=science&FORMAT=kvn",
  Filename = "science.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/weather/aqua.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/weather/aqua.asset
@@ -9,7 +9,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_aqua",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?CATNR=27424&FORMAT=kvn",
  Filename = "Aqua.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/weather/argos.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/weather/argos.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_argos",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?GROUP=argos&FORMAT=kvn",
  Filename = "argos.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/weather/dmc.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/weather/dmc.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_dmc",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?GROUP=dmc&FORMAT=kvn",
  Filename = "dmc.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/weather/earth_resources.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/weather/earth_resources.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_resource",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?GROUP=resource&FORMAT=kvn",
  Filename = "resource.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/weather/goes.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/weather/goes.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_goes",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?GROUP=goes&FORMAT=kvn",
  Filename = "goes.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/weather/noaa.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/weather/noaa.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_noaa",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?GROUP=noaa&FORMAT=kvn",
  Filename = "noaa.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/weather/planet.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/weather/planet.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_planet",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?GROUP=planet&FORMAT=kvn",
  Filename = "planet.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/weather/sarsat.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/weather/sarsat.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_sarsat",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?GROUP=sarsat&FORMAT=kvn",
  Filename = "sarsat.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/weather/snpp.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/weather/snpp.asset
@@ -9,7 +9,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_snpp",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?CATNR=37849&FORMAT=kvn",
  Filename = "SNPP.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/weather/spire.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/weather/spire.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_spire",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?GROUP=spire&FORMAT=kvn",
  Filename = "spire.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/weather/tdrss.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/weather/tdrss.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_tdrss",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?GROUP=tdrss&FORMAT=kvn",
  Filename = "tdrss.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/weather/terra.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/weather/terra.asset
@@ -9,7 +9,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_terra",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?CATNR=25994&FORMAT=kvn",
  Filename = "Terra.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/planets/earth/satellites/weather/weather.asset
+++ b/data/assets/scene/solarsystem/planets/earth/satellites/weather/weather.asset
@@ -8,7 +8,7 @@ local omm = asset.resource({
  Identifier = "satellite_omm_data_weather",
  Url = "https://www.celestrak.com/NORAD/elements/gp.php?GROUP=weather&FORMAT=kvn",
  Filename = "weather.txt",
-  SecondsUntilResync = 24 * 60 * 60
+  SecondsUntilResync = openspace.time.secondsPerDay()
 })


--- a/data/assets/scene/solarsystem/sssb/c2019y4atlas.asset
+++ b/data/assets/scene/solarsystem/sssb/c2019y4atlas.asset
@@ -10,6 +10,9 @@ local orbit = asset.resource({
 }) .. "c2019y4atlas.hrz"


+local StartTime = "1950 JAN 1 00:00:00"
+local EndTime = "2100 JAN 1 00:00:00"
+
 local C2019Y4AtlasTrail = {
  Identifier = "C2019Y4AtlasTrail",
  Parent = sunTransforms.SolarSystemBarycenter.Identifier,
@@ -26,10 +29,9 @@ local C2019Y4AtlasTrail = {
    },
    Color = { 0.533333, 0.850980, 0.996078 },
    EnableFade = false,
-    StartTime = "1950 JAN 1 0:00:00",
-    EndTime = "2100 JAN 1 00:00:00",
-    SampleInterval = 52595, -- About 14h 36m 35.5200s in seconds
-    TimeStampSubsampleFactor = 1
+    StartTime = StartTime,
+    EndTime = EndTime,
+    SampleInterval = openspace.time.duration(StartTime, EndTime) / 90000
  },
  GUI = {
    Name = "C2019 Y4 Atlas Trail",
--- a/src/util/time.cpp
+++ b/src/util/time.cpp
@@ -223,6 +223,9 @@ scripting::LuaLibrary Time::luaLibrary() {
            codegen::lua::CurrentApplicationTime,
            codegen::lua::AdvancedTime,
            codegen::lua::ConvertTime,
+            codegen::lua::Duration,
+            codegen::lua::SecondsPerDay,
+            codegen::lua::SecondsPerYear
        }
    };
 }
--- a/src/util/time_lua.inl
+++ b/src/util/time_lua.inl
@@ -22,6 +22,8 @@
 * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                                         *
 ****************************************************************************************/

+#include <openspace/util/timeconversion.h>
+
 namespace {

 /**
@@ -374,6 +376,36 @@ namespace {
    }
 }

+/**
+ * Returns the number of seconds between the provided start time and end time. If the end
+ * time is before the start time, the return value is negative. If the start time is equal
+ * to the end time, the return value is 0.
+ * Both start and end times must be valid ISO 8601 date strings.
+ */
+[[codegen::luawrap]] double duration(std::string start, std::string end) {
+    using namespace openspace;
+
+    const double tStart = Time::convertTime(start);
+    const double tEnd = Time::convertTime(end);
+    return tEnd - tStart;
+}
+
+/**
+ * Returns the number of seconds per day where a day in this case is exactly 24 hours.
+ * The total number of seconds is equal to 86400.
+ */
+[[codegen::luawrap]] int secondsPerDay() {
+    return openspace::SecondsPerDay;
+}
+
+/**
+ * Returns the number of seconds in a Julian year, which is equal to 31557600.
+ */
+[[codegen::luawrap]] int secondsPerYear() {
+    // We could use a call to SPICE here, but the value is a constant anyway
+    return openspace::SecondsPerYear;
+}
+
 #include "time_lua_codegen.cpp"

 } // namespace