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-rw-r--r--org/madore/ephem/Precession.java8
1 files changed, 5 insertions, 3 deletions
diff --git a/org/madore/ephem/Precession.java b/org/madore/ephem/Precession.java
index 5ac3a03..b52a1c5 100644
--- a/org/madore/ephem/Precession.java
+++ b/org/madore/ephem/Precession.java
@@ -3,16 +3,18 @@ package org.madore.ephem;
public final class Precession {
// The following angles are in arcseconds, argument is in Julian centuries since J2000.
- public static final double epsilon = 84381.406;
+ public static final double epsilon0 = 84381.406;
public static Comput.Polynomial psi
= new Comput.Polynomial(0, 5038.481507, -1.0790069, -0.00114045, 0.000132851, -0.0000000951);
public static Comput.Polynomial omega
- = new Comput.Polynomial(epsilon, -0.025754, 0.0512623, -0.00772503, -0.000000467, 0.0000003337);
+ = new Comput.Polynomial(epsilon0, -0.025754, 0.0512623, -0.00772503, -0.000000467, 0.0000003337);
public static Comput.Polynomial chi
= new Comput.Polynomial(0, 10.556403, -2.3814292, -0.00121197, 0.000170663, -0.0000000560);
+ public static Comput.Polynomial epsilon
+ = new Comput.Polynomial(epsilon0, -46.836769, -0.0001831, 0.00200340, -0.000000576, -0.0000000434);
public static Frames.RotationMatrix matrix(double t) {
- Frames.RotationMatrix mat1 = Frames.RotationMatrix.rotx(epsilon*Comput.arcsecond);
+ Frames.RotationMatrix mat1 = Frames.RotationMatrix.rotx(epsilon0*Comput.arcsecond);
Frames.RotationMatrix mat2 = Frames.RotationMatrix.rotz(-psi.v(t)*Comput.arcsecond).apply(mat1);
Frames.RotationMatrix mat3 = Frames.RotationMatrix.rotx(-omega.v(t)*Comput.arcsecond).apply(mat2);
Frames.RotationMatrix mat4 = Frames.RotationMatrix.rotz(chi.v(t)*Comput.arcsecond).apply(mat3);