Skyfield is a pure-Python astronomy package that is compatible with both Python 3 and makes it easy to generate high precision research-grade positions for planets and Earth satellites.

Skyfield computes positions for the stars, planets, and satellites in orbit around the Earth. Its results should agree with the positions generated by the United States Naval Observatory and their Astronomical Almanac to within 0.0005 arcseconds (which equals half a “mas” or milliarcsecond).