|ID||I||day in year (1 = Jan 1st)|
|FD||R||fraction of day|
|PV||R(6)||Moon , mean equator and equinox of date (AU, AU s-1)|
per hour in longitude, and
per hour in latitude, 350 km and 2 metres per second in distance.) Note that the distance accuracy is comparatively poor because this routine is principally intended for computing topocentric direction.
SLALIB --- Positional Astronomy Library