Skyfield is a pure-Python astronomy package that is compatible with both Python 2 and 3 and makes it easy to generate high precision research-grade positions for planets and Earth satellites.

from skyfield.api import earth, mars, now
ra, dec, distance = earth(now()).observe(mars).radec()

print(ra)
print(dec)
print(distance)

09h 14m 50.35s
+17deg 13' 02.6"
2.18572863461 AU

Its only binary dependency is NumPy. Skyfield can usually be installed with:

pip install skyfield

Here are the essential project links:

• Home page and documentation.
• Skyfield package on the Python Package Index.
• Issue tracker on GitHub.