The source coordinate system (before the “2”) is converted to the desired coordinate system:
Abbreviations:
AER: Azimuth, Elevation, Range
aer2ecef aer2eci aer2enu aer2geodetic aer2ned ecef2aer ecef2eci ecef2enu ecef2enuv ecef2geodetic ecef2ned eci2aer eci2ecef enu2aer enu2ecef enu2geodetic env2uvw geodetic2aer geodetic2ecef geodetic2enu geodetic2ned get_radius_normal greenwichsrt lookAtSpheroid R3 referenceEllipsoid vdist vreckon wgs84Ellipsoid
ECEF: Earth-centered, Earth-fixed ECI: Earth-centered Inertial ENU: East North Up NED: North East Down radec: right ascension, declination Caveats Atmospheric effects neglected in all functions not invoking AstroPy. Would need to update code to add these input parameters (just start a GitHub Issue to request). Planetary perturbations and nutation etc. not fully considered.
These functions present a similar API of a subset of functions in the Mathworks Matlab: