Sunrise time on Mars

Calculates the sunrise time for a horizontal or inclined surface on Mars. Returns NA during polar night/day periods.

Usage

sunrise(Ls, phi, beta = NULL, gamma_c = NULL, unit = 1)

Arguments

Ls

Areocentric longitude [deg]

phi

Planetary latitude [deg]

beta

Surface tilt angle [deg]. Optional, for inclined surfaces

gamma_c

Surface azimuth angle [deg]. Optional, for inclined surfaces. Zero facing equator, east negative, west positive (-180 to +180)

unit

Output unit: 1 for radians, 2 for degrees, 3 for solar hours (default: 1)

Value

Sunrise time [rad], [deg], or [h] depending on unit parameter, or NA during polar night/day