palPrec
palPrec
- Form the matrix of precession between two epochs (IAU 2006)
Description:
The IAU 2006 precession matrix from ep0 to ep1 is found and
returned. The matrix is in the sense V(EP1) = RMATP V(EP0).
The epochs are TDB (loosely TT) Julian epochs.
Though the matrix method itself is rigorous, the precession
angles are expressed through canonical polynomials which are
valid only for a limited time span of a few hundred years around
the current epoch.