Astronomical Sky Calculator
Based on a sky calculator programme written by John Thorstensen of
Precesses coordinates, provides sun & moon rise & set times, moon
phase, LMST, Galactic coordinates, parallactic angle, an hourmass table,
Julian date, moon phase and more besides. Just provide location, date,
time and coordinates. CAUTION: this web interface performs only very
limited validity checking, please do not try and find these limits.
Brian Casey provides
another interface to John's programme, this
time as a calculator of general phenomena for each night in a selected
range of months.
Source code, Cautions and Legalities
Algorithms and Accuracy