Added options to use sidereal vs solar time, Earth vs Kerbin time, and rounded vs true time.
Added options to use sidereal vs solar time, Earth vs Kerbin time, and rounded vs true time.

file:b/API/Enums.cs (new)
--- /dev/null
+++ b/API/Enums.cs
@@ -1,1 +1,25 @@
+// VOID © 2015 toadicus
+//
+// This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. To view a
+// copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/3.0/
+using System;
 
+namespace VOID
+{
+	public enum VOID_TimeScale : UInt32
+	{
+		KERBIN_TIME = 1, // Earth if 0
+		SOLAR_DAY = 4, // Sidereal if 0
+		ROUNDED_SCALE = 1024 // Real values if 0
+	}
+
+	public enum IconState : UInt32
+	{
+		PowerOff = 1,
+		PowerOn = 2,
+		Inactive = 4,
+		Active = 8
+	}
+}
+
+

--- a/API/VOIDCore.cs
+++ b/API/VOIDCore.cs
@@ -64,6 +64,8 @@
 		public abstract Stage LastStage { get; protected set; }
 		public abstract Stage[] Stages { get; protected set; }
 
+		public abstract VOID_TimeScale TimeScale { get; protected set; }
+
 		public abstract event VOIDEventHandler onApplicationQuit;
 		public abstract event VOIDEventHandler onSkinChanged;
 

--- a/Properties/AssemblyInfo.cs
+++ b/Properties/AssemblyInfo.cs
@@ -39,7 +39,7 @@
 // The assembly version has the format "{Major}.{Minor}.{Build}.{Revision}".
 // The form "{Major}.{Minor}.*" will automatically update the build and revision,
 // and "{Major}.{Minor}.{Build}.*" will update just the revision.
-[assembly: AssemblyVersion("0.16.4.*")]
+[assembly: AssemblyVersion("0.17.*")]
 // The following attributes are used to specify the signing key for the assembly,
 // if desired. See the Mono documentation for more information about signing.
 //[assembly: AssemblyDelaySign(false)]

--- a/Tools/VOID_DataValue.cs
+++ b/Tools/VOID_DataValue.cs
@@ -264,6 +264,11 @@
 
 		public virtual int DoGUIHorizontalPrec(int digits)
 		{
+			if (digits < 0 || digits > 8)
+			{
+				digits = 5;
+			}
+
 			GUILayout.BeginHorizontal(GUILayout.ExpandWidth(true));
 			GUILayout.Label(this.Label + "ⁱ:", GUILayout.ExpandWidth(true));
 			GUILayout.FlexibleSpace();

--- a/Tools/VOID_Tools.cs
+++ b/Tools/VOID_Tools.cs
@@ -414,28 +414,55 @@
 			{
 				get
 				{
-					if (GameSettings.KERBIN_TIME)
+					VOID_TimeScale flags = VOID_Data.Core.TimeScale &
+						(VOID_TimeScale.KERBIN_TIME | VOID_TimeScale.SOLAR_DAY | VOID_TimeScale.ROUNDED_SCALE);
+
+					switch (flags)
 					{
-						return 21600d;
+						// Earth day, sidereal
+						case 0:
+							return 86164.1d;
+						// Earth day, solar (also rounded)
+						case VOID_TimeScale.ROUNDED_SCALE | VOID_TimeScale.SOLAR_DAY:
+						case VOID_TimeScale.ROUNDED_SCALE:
+						case VOID_TimeScale.SOLAR_DAY:
+							return 86400d;
+						// Kerbin day, solar
+						case VOID_TimeScale.KERBIN_TIME | VOID_TimeScale.SOLAR_DAY:
+							return 21650.813d;
+						// Kerbin day, sidereal (also rounded)
+						default:
+							return 21600d;
 					}
-					else
+				}
+			}
+
+			public static double SecondsPerYear
+			{
+				get
+				{
+					VOID_TimeScale flags = VOID_Data.Core.TimeScale &
+						(VOID_TimeScale.KERBIN_TIME | VOID_TimeScale.SOLAR_DAY | VOID_TimeScale.ROUNDED_SCALE);
+
+					switch (flags)
 					{
-						return 86164.1d;
-					}
-				}
-			}
-
-			public static double SecondsPerYear
-			{
-				get
-				{
-					if (GameSettings.KERBIN_TIME)
-					{
-						return 9203545d;
-					}
-					else
-					{
-						return 31558149d;
+						// Earth year, rounded
+						case VOID_TimeScale.SOLAR_DAY | VOID_TimeScale.ROUNDED_SCALE:
+						case VOID_TimeScale.ROUNDED_SCALE:
+							return 60 * 60 * 24 * 365;
+						// Kerbin year, rounded
+						case VOID_TimeScale.KERBIN_TIME | VOID_TimeScale.SOLAR_DAY | VOID_TimeScale.ROUNDED_SCALE:
+						case VOID_TimeScale.KERBIN_TIME | VOID_TimeScale.ROUNDED_SCALE:
+							return 60 * 60 * 6 * 426;
+						// Earth year, solar time
+						case VOID_TimeScale.SOLAR_DAY:
+							return 31556925.2507328;
+						// Earth year, sidereal time
+						case 0:
+							return 31558149.7635456d;
+						// Kerbin year, solar & sidereal time
+						default:
+							return 9203544.61750141d;
 					}
 				}
 			}

--- a/VOID.csproj
+++ b/VOID.csproj
@@ -115,6 +115,7 @@
     <Compile Include="Tools\VOID_StageExtensions.cs" />
     <Compile Include="API\VOID_SingletonCore.cs" />
     <Compile Include="API\VOID_SingletonWindow.cs" />
+    <Compile Include="API\Enums.cs" />
   </ItemGroup>
   <ProjectExtensions>
     <MonoDevelop>

--- a/VOIDCore_Generic.cs
+++ b/VOIDCore_Generic.cs
@@ -90,6 +90,9 @@
 		[AVOID_SaveValue("vesselSimActive")]
 		protected VOID_SaveValue<bool> vesselSimActive;
 
+		[AVOID_SaveValue("timeScaleFlags")]
+		protected VOID_SaveValue<UInt32> timeScaleFlags;
+
 		// Vessel Type Housekeeping
 		protected bool vesselTypesLoaded = false;
 
@@ -257,6 +260,18 @@
 			protected set;
 		}
 
+		public override VOID_TimeScale TimeScale
+		{
+			get
+			{
+				return (VOID_TimeScale)this.timeScaleFlags.value;
+			}
+			protected set
+			{
+				this.timeScaleFlags.value = (UInt32)value;
+			}
+		}
+
 		protected IconState activeState
 		{
 			get
@@ -596,6 +611,57 @@
 
 			this.vesselSimActive.value = GUITools.Toggle(this.vesselSimActive.value,
 				"Enable Engineering Calculations");
+
+			bool useEarthTime = (this.TimeScale & VOID_TimeScale.KERBIN_TIME) == 0u;
+			bool useSiderealTime = (this.TimeScale & VOID_TimeScale.SOLAR_DAY) == 0u;
+			bool useRoundedScale = (this.TimeScale & VOID_TimeScale.ROUNDED_SCALE) != 0u;
+
+			useEarthTime = GUITools.Toggle(useEarthTime, "Use Earth Time (changes KSP option)");
+
+			GameSettings.KERBIN_TIME = !useEarthTime;
+
+			useSiderealTime = GUITools.Toggle(
+				useSiderealTime,
+				string.Format(
+					"Time Scale: {0}",
+					useSiderealTime ? "Sidereal" : "Solar"
+				)
+			);
+
+			useRoundedScale = GUITools.Toggle(
+				useRoundedScale,
+				string.Format(
+					"Time Scale: {0}",
+					useRoundedScale ? "Rounded" : "True"
+				)
+			);
+
+			if (useEarthTime)
+			{
+				this.TimeScale &= ~VOID_TimeScale.KERBIN_TIME;
+			}
+			else
+			{
+				this.TimeScale |= VOID_TimeScale.KERBIN_TIME;
+			}
+
+			if (useSiderealTime)
+			{
+				this.TimeScale &= ~VOID_TimeScale.SOLAR_DAY;
+			}
+			else
+			{
+				this.TimeScale |= VOID_TimeScale.SOLAR_DAY;
+			}
+
+			if (useRoundedScale)
+			{
+				this.TimeScale |= VOID_TimeScale.ROUNDED_SCALE;
+			}
+			else
+			{
+				this.TimeScale &= ~VOID_TimeScale.ROUNDED_SCALE;
+			}
 
 			GUILayout.BeginHorizontal(GUILayout.ExpandWidth(true));
 
@@ -1038,6 +1104,8 @@
 			{
 				module.LoadConfig();
 			}
+
+			this.TimeScale |= GameSettings.KERBIN_TIME ? VOID_TimeScale.KERBIN_TIME : 0u;
 		}
 
 		public override void SaveConfig()
@@ -1119,14 +1187,6 @@
 			_instance = null;
 			_initialized = false;
 		}
-
-		protected enum IconState
-		{
-			PowerOff = 1,
-			PowerOn = 2,
-			Inactive = 4,
-			Active = 8
-		}
 	}
 }
 

--- a/VOID_DataLogger.cs
+++ b/VOID_DataLogger.cs
@@ -317,8 +317,8 @@
 					"\"Altitude above terrain (m)\"," +
 					"\"Surface Latitude (°)\"," +
 					"\"Surface Longitude (°)\"," +
-					"\"Apoapsis Altitude (m)\"" +
-					"\"Periapsis Altitude (m)\"" +
+					"\"Apoapsis Altitude (m)\"," +
+					"\"Periapsis Altitude (m)\"," +
 					"\"Orbital Velocity (m/s)\"," +
 					"\"Surface Velocity (m/s)\"," +
 					"\"Vertical Speed (m/s)\"," +
@@ -360,16 +360,16 @@
 			line.Append('"');
 			line.Append(',');
 
+			// Apoapsis Altitude
+			line.Append(VOID_Data.orbitApoAlt.Value.ToString("G3"));
+			line.Append(',');
+
+			// Periapsis Altitude
+			line.Append(VOID_Data.oribtPeriAlt.Value.ToString("G3"));
+			line.Append(',');
+
 			//Orbital velocity
 			line.Append(VOID_Data.orbitVelocity.Value.ToString("F3"));
-			line.Append(',');
-
-			// Apoapsis Altitude
-			line.Append(VOID_Data.orbitApoAlt.Value.ToString("G3"));
-			line.Append(',');
-
-			// Periapsis Altitude
-			line.Append(VOID_Data.oribtPeriAlt.Value.ToString("G3"));
 			line.Append(',');
 
 			//surface velocity