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Diffstat (limited to 'org/madore/ephem/Nutation.java')
| -rw-r--r-- | org/madore/ephem/Nutation.java | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/org/madore/ephem/Nutation.java b/org/madore/ephem/Nutation.java index bc6e721..8c37fd2 100644 --- a/org/madore/ephem/Nutation.java +++ b/org/madore/ephem/Nutation.java @@ -64,6 +64,7 @@ public final class Nutation { } public static Frames.Rotation matrix(double t) { + // Transform mean equatorial coordinates of date to true equatorial coordinates of date. Frames.Rotation mat1 = Frames.Rotation.rotx(Precession.epsilon.v(t)*Comput.arcsecond); Frames.Rotation mat2 = Frames.Rotation.rotz(-getFunc(Variable.PSI).v(t)*Comput.arcsecond).apply(mat1); Frames.Rotation mat3 = Frames.Rotation.rotx(-(Precession.epsilon.v(t)+getFunc(Variable.EPSILON).v(t))*Comput.arcsecond).apply(mat2); |