1 files changed, 56 insertions, 0 deletions
diff --git a/org/madore/ephem/Time.java b/org/madore/ephem/Time.java
new file mode 100644
index 0000000..3d2cb3e
--- /dev/null
+++ b/org/madore/ephem/Time.java
@@ -0,0 +1,56 @@
+package org.madore.ephem;
+
+public final class Time {
+
+    public static final class LeapSecond {
+	public int mjd;
+	public int offset;
+	public LeapSecond(int mjd, int offset) {
+	    this.mjd = mjd;
+	    this.offset = offset;
+	}
+    }
+
+    public static final LeapSecond[] leapSecondsTable = new LeapSecond[] {
+	new LeapSecond(41317, 10),
+	new LeapSecond(41499, 11),
+	new LeapSecond(41683, 12),
+	new LeapSecond(42048, 13),
+	new LeapSecond(42413, 14),
+	new LeapSecond(42778, 15),
+	new LeapSecond(43144, 16),
+	new LeapSecond(43509, 17),
+	new LeapSecond(43874, 18),
+	new LeapSecond(44239, 19),
+	new LeapSecond(44786, 20),
+	new LeapSecond(45151, 21),
+	new LeapSecond(45516, 22),
+	new LeapSecond(46247, 23),
+	new LeapSecond(47161, 24),
+	new LeapSecond(47892, 25),
+	new LeapSecond(48257, 26),
+	new LeapSecond(48804, 27),
+	new LeapSecond(49169, 28),
+	new LeapSecond(49534, 29),
+	new LeapSecond(50083, 30),
+	new LeapSecond(50630, 31),
+	new LeapSecond(51179, 32),
+	new LeapSecond(53736, 33),
+	new LeapSecond(54832, 34),
+	new LeapSecond(56109, 35),
+    };
+
+    public static double utcToTt(int utcMjd, double utcSeconds) {
+	// Returns JD in TT
+	int i0 = 0;  int i1 = leapSecondsTable.length;
+	while ( i1-i0 > 1 ) {
+	    int i = (i0+i1)/2;
+	    if ( utcMjd >= leapSecondsTable[i].mjd )
+		i0 = i;
+	    else
+		i1 = i;
+	}
+	return ( utcSeconds + leapSecondsTable[i0].offset + 32.184 )/86400. + utcMjd + 2400000.5;
+    }
+
+}