This library provides a C library designed as a API-compatible
replacement for the C SLALIB library (SUN/67) and uses a GPL licence so is
freely redistributable. Where possible the functions call equivalent
SOFA routines (Hohenkerk, C., 2011, Scholarpedia, 6, 11404)
and use current IAU 2006 standards. This means that any
functions that rely on nutation or precession will return slightly
different answers to the SLA functions.