ecl_elong

skysim.zodiacal.ecl_elong(ecl_lon, ecl_lat)

Calculate the elongation for a specified ecliptic longitude and latitude.

Use equation (11) of Leinert 1998:

\[\cos\epsilon = \cos(\lambda - \lambda_\odot) \cos\beta\]

Parameters

ecl_lonfloat or array

Heliocentric ecliptic longitude in degrees.

ecl_latfloat or array

Ecliptic latitude in degrees.

Returns

float or array

Ecliptic elongation in degrees.