ApproxAnnualPrecession returns approximate annual precision in right ascension and declination.

ApproxPosition uses ApproxAnnualPrecession to compute a simple and quick precession while still considering proper motion.

EclipticPosition precesses ecliptic coordinates from one epoch to another, including proper motions.

NewEclipticPrecessor constructs an EclipticPrecessor object and initializes it to precess coordinates from epochFrom to epochTo.

NewPrecessor constructs a Precessor object and initializes it to precess coordinates from epochFrom to epochTo.

Position precesses equatorial coordinates from one epoch to another, including proper motions.

ProperMotion3D takes the 3D equatorial coordinates of an object at one epoch and computes its coordinates at a new epoch, considering proper motion and radial velocity.

coefficients from (21.3) p.

coefficients from (21.2) p.

coefficients from (21.6) p.

coefficients from (21.5) p.

Package variables allow these slices to be reused.

Package variables allow these slices to be reused.

EclipticPrecessor represents precession from one epoch to another.

Precessor represents precession from one epoch to another.