Solar declination angle on Mars

Calculates the angular position of the Sun at solar noon with respect to the plane of the Martian equator. For Mars: -24.936° <= delta <= 24.936°. The declination is 0° at vernal (Ls=0°) and autumnal equinoxes (Ls=180°), +24.936° at summer solstice (Ls=90°), and -24.936° at winter solstice (Ls=270°). Implements Equation 7 from Appelbaum & Flood (1990).

Usage

declination(Ls, unit = 1)

Arguments

Ls

Areocentric longitude [deg]

unit

Output unit: 1 for radians, 2 for degrees (default: 1)

Value

Declination angle [rad] or [deg] depending on unit parameter