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JPLephem loads and uses standard Jet Propulsion Laboratory (JPL) ephemerides for predicting the position and velocity of a planet or other Solar System body. It is one of the foundations of the Skyfield (ascl:1907.024) astronomy library for Python, and can also be used as a standalone package to generate raw vectors.
gammaALPs calculates the conversion probability between photons and axions/axion-like particles in various astrophysical magnetic fields. Though focused on environments relevant to mixing between gamma rays and ALPs, this suite, written in Python, can also be used for broader applications. The code also implements various models of astrophysical magnetic fields, which can be useful for applications beyond ALP searches.