ssapy_toolkit.Coordinates.surface_rv

ssapy_toolkit.Coordinates.surface_rv(lon, lat, elevation=0.0, t=<Time object: scale='utc' format='gps' value=0.0>)[source]

Get GCRF position and velocity of a surface observer at a specific location and time.

Parameters:

  • lat (float) – Geodetic latitude in degrees.

  • lon (float) – Geodetic longitude in degrees.

  • elevation (float, optional) – Elevation above sea level in meters (default is 0).

  • t (Time) – Astropy Time object.

Returns:

  • r (ndarray, shape (3,)) – Position vector in GCRF coordinates (m).

  • v (ndarray, shape (3,)) – Velocity vector in GCRF coordinates (m/s).