pynrc.simul.skyvec2ins.lb2ei

pynrc.simul.skyvec2ins.lb2ei(lmlsun, beta)[source]

Convert ecliptic coordinates (lambda-lambda_sun, beta) to alternative ecliptic coordinates (epsilon, i) according to Eq 11 in Leinert et al. 1998.

Parameters:

  • beta (numpy.ndarray) – Ecplitic longitude in radians.

  • lmlsun (numpy.ndarray) – Ecliptic lattitude in radians.

Returns:

  • elong (numpy.ndarray) – Elongation (angular distance from the sun to the field-of-view) in radians.

  • inc (numpy.ndarray) – Inclination (position angle counted from the ecliptic counterclockwise) in radians.