Constant MARS_LS_M0 

pub const MARS_LS_M0: Real = _; // 19.3871f64

Areocentric solar longitude (Ls) constants from the current NASA GISS Mars24 algorithm (AM2000 short series, updated 2025-01-07).

Ls = 0° → northern vernal equinox (Martian northern spring begins) Ls = 90° → northern summer solstice Ls = 180° → northern autumnal equinox Ls = 270° → northern winter solstice