Aberration returns corrections due to aberration for equatorial coordinates of an object.

AberrationRonVondrak uses the Ron-Vondrák expression to compute corrections due to aberration for equatorial coordinates of an object.

EclipticAberration returns corrections due to aberration for ecliptic coordinates of an object.

Nutation returns corrections due to nutation for equatorial coordinates of an object.

Position computes the apparent position of an object.

PositionRonVondrak computes the apparent position of an object using the Ron-Vondrák expression for aberration.

κ is the constnt of aberration in radians.