diff --git a/apps/OpenSpace/ext/launcher/src/profile/horizonsdialog.cpp b/apps/OpenSpace/ext/launcher/src/profile/horizonsdialog.cpp
index 7479f9cfe2..f0855d7566 100644
--- a/apps/OpenSpace/ext/launcher/src/profile/horizonsdialog.cpp
+++ b/apps/OpenSpace/ext/launcher/src/profile/horizonsdialog.cpp
@@ -531,11 +531,29 @@ bool HorizonsDialog::isValidInput() {
         isValid = false;
         message = "Step size not selected";
     }
-    // In the case of arcseconds, first option
-    else if (_timeTypeCombo->currentIndex() == 0) {
-        if (60 > _stepEdit->text().toInt() || _stepEdit->text().toInt() > 3600) {
+    // Check if input is numerical
+    bool couldConvert = false;
+    int32_t step = _stepEdit->text().toInt(&couldConvert);
+    if (!couldConvert) {
+        isValid = false;
+        message = "Step size needs to be a number in range 1 to " +
+            std::to_string(std::numeric_limits<int32_t>::max());
+    }
+    else {
+        // In the case of arcseconds (first option) range is different
+        if (_timeTypeCombo->currentIndex() == 0) {
+            if (60 > step || step > 3600) {
+                isValid = false;
+                message = "Angular step size needs to be in range 60 to 3600";
+            }
+        }
+        // Numbers only and in range 1 to 2147483647 (max of 32 bit int)
+        // Horizons read the step size into a 32 bit int, but verifies the input on their
+        // website as a uint32_t. If step size over 32 bit int is sent, this error
+        // message is recived: Cannot read numeric value -- re-enter
+        else if (1 > step || step > std::numeric_limits<int32_t>::max()) {
             isValid = false;
-            message = "Angular step size need to be in range 60 to 3600";
+            message = "Step size is outside valid range 1 to " + std::to_string(std::numeric_limits<int32_t>::max());
         }
     }
 
@@ -784,6 +802,13 @@ bool HorizonsDialog::handleResult(openspace::HorizonsFile::HorizonsResult& resul
             break;
         }
 
+        case openspace::HorizonsFile::HorizonsResult::ErrorSpan:
+            appendLog(
+                "Step size is too big, exceeds available time span for target",
+                HorizonsDialog::LogLevel::Error
+            );
+            break;
+
         case openspace::HorizonsFile::HorizonsResult::ErrorTimeRange: {
             appendLog("Time range is outside the valid range for target '"
                 + _targetName + "'.", HorizonsDialog::LogLevel::Error);
diff --git a/modules/space/horizonsfile.cpp b/modules/space/horizonsfile.cpp
index 70ea3b144c..e21995855e 100644
--- a/modules/space/horizonsfile.cpp
+++ b/modules/space/horizonsfile.cpp
@@ -66,6 +66,10 @@ HorizonsFile::HorizonsResult HorizonsFile::isValidAnswer(const json& answer) {
         if (errorMessage.find("Projected output length") != std::string::npos) {
             return HorizonsFile::HorizonsResult::ErrorSize;
         }
+        // STEP_SIZE too big, exceeds available span.
+        else if (errorMessage.find("STEP_SIZE too big") != std::string::npos) {
+            return HorizonsFile::HorizonsResult::ErrorSpan;
+        }
         // No ephemeris for target "X" after A.D. Y UT
         else if (errorMessage.find("No ephemeris for target") != std::string::npos) {
             return HorizonsFile::HorizonsResult::ErrorTimeRange;
@@ -125,6 +129,12 @@ HorizonsFile::HorizonsResult HorizonsFile::isValidHorizonsFile() const {
             return HorizonsFile::HorizonsResult::ErrorSize;
         }
 
+        // Selected time range too big for avalable time span?
+        if (line.find("STEP_SIZE too big") != std::string::npos) {
+            fileStream.close();
+            return HorizonsFile::HorizonsResult::ErrorSpan;
+        }
+
         // Outside valid time range?
         if (line.find("No ephemeris for target") != std::string::npos) {
             // Available time range is located several lines before this in the file
diff --git a/modules/space/horizonsfile.h b/modules/space/horizonsfile.h
index dc70e2e718..c41c1bdf1b 100644
--- a/modules/space/horizonsfile.h
+++ b/modules/space/horizonsfile.h
@@ -55,6 +55,7 @@ public:
 
         // Erros caught by the error field in the json output
         ErrorSize,
+        ErrorSpan,
         ErrorTimeRange,
         ErrorNoObserver,
         ErrorObserverTargetSame,