diff --git a/Meade.net.Telescope/AstroMaths/AstroMathExtensions.cs b/Meade.net.Telescope/AstroMaths/AstroMathExtensions.cs
new file mode 100644
index 0000000..9254007
--- /dev/null
+++ b/Meade.net.Telescope/AstroMaths/AstroMathExtensions.cs
@@ -0,0 +1,79 @@
+using System;
+using ASCOM.Utilities;
+
+namespace ASCOM.Meade.net.AstroMaths
+{
+    public static class AstroMathExtensions
+    {
+        public static double DegreesToRadians(this double degrees)
+        {
+            return (Math.PI / 180) * degrees;
+        }
+
+        public static double RadiansToDegrees(this double radians)
+        {
+            double degrees = (180 / Math.PI) * radians;
+            return degrees;
+        }
+
+        public static double DateTimeToDecimalHours(this DateTime utcDateTime)
+        {
+            double sec = utcDateTime.Second;
+            double min = utcDateTime.Minute;
+            double hour = utcDateTime.Hour;
+
+            var a = Math.Abs(sec) / 60;
+            var b = (Math.Abs(min) + a) / 60;
+            var c = Math.Abs(hour) + b;
+
+            var d = c;
+
+            if ((hour < 0) || (min < 0) || (sec < 0))
+                d = -c;
+
+            return d;
+        }
+
+        public static double UTtoGst( this DateTime utcDateTime)
+        {
+            Util util = new Util();
+
+            var jd = util.DateUTCToJulian(utcDateTime) - 0.5;
+            if ((jd % 1) <= 0.5)
+                jd = Math.Floor(jd);
+            else
+                jd = Math.Floor(jd) + 0.5;
+
+            var s = jd - 2451545.0;
+            var t = s / 36525.0;
+            var t0 = 6.697374558 + (2400.051336 * t) + (0.000025862 * (t * t));
+
+            while (t0 < 0)
+            {
+                t0 += 24;
+            }
+
+            while (t0 >= 24)
+            {
+                t0 -= 24;
+            }
+
+            var ut = DateTimeToDecimalHours(utcDateTime);
+            var a = ut * 1.002737909;
+
+            var t1 = t0 + a;
+
+            while (t1 < 0)
+            {
+                t1 += 24;
+            }
+
+            while (t1 >= 24)
+            {
+                t1 -= 24;
+            }
+
+            return t1;
+        }
+    }
+}
\ No newline at end of file