earth_limb

earth_limb(position)

Compute alpha limb angle

Limb angle is defined to be the angle between the earth direction and a tangent line (see AlG slides for scheme and maths)

documentation: * simulation_correction_cxb_earth_15_05_2020_v2_alg.pdf (version 2) p.5 * simulation_correction_pipeline_cxb_earth_15_05_2020_v2_pb.pdf (version 2) p.3

Parameters:position – instrument position (X, Y, Z) in geocentric frame.

Assume coordinates are given in km. Default is None. :type position: array :return: limb angle in degrees :rtype: float