Position and velocity of an observing station. (double precision)
p double latitude (geodetic, radians) h double height above reference spheroid (geodetic, metres) stl double local apparent sidereal time (radians)
pv double[6] position/velocity 6-vector (au, au/s, geocentric apparent) IAU 1976 constants are used.
slaGeoc Deined in slamac.h: DS2R P.T.Wallace Starlink 30 October 1993