"PyEphem provides basic astronomical computations
for the Python programming language.
Given a date and location on the Earth’s surface,
it can compute the positions of the Sun and Moon,
of the planets and their moons,
and of any asteroids, comets, or earth satellites
whose orbital elements the user can provide.
Additional functions are provided to compute the angular separation
between two objects in the sky,
to determine the constellation in which an object lies,
and to find the times at which
an object rises, transits, and sets on a particular day.
The numerical routines that lie behind PyEphem
are those from the wonderful XEphem astronomy application,
whose author, Elwood Downey, generously gave permission
for us to use them as the basis for PyEphem.
http://rhodesmill.org/pyephem/
http://rhodesmill.org/pyephem/tutorial.html
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