pub const MOON_MASS: f64 = 7.342e22;
pub const MOON_RADIUS_M: f64 = 1_737_400.0;
pub const EARTH_MASS: f64 = 5.9722e24;
pub const EARTH_RADIUS_M: f64 = 6_371_000.0;
pub const EARTH_MOON_DISTANCE_M: f64 = 384_400_000.0;
pub const SIDEREAL_ORBIT_PERIOD_S: f64 = 27.321_661 * 86_400.0;
pub const SYNODIC_MONTH_S: f64 = 29.530_588 * 86_400.0;
pub const SURFACE_GRAVITY_M_S2: f64 = 1.62;
pub const ESCAPE_VELOCITY_M_S: f64 = 2_380.0;
pub const GEOMETRIC_ALBEDO: f64 = 0.12;
pub const SOLAR_CONSTANT_AT_MOON_W_M2: f64 = 1_361.0;
pub const H24_RUNTIME_HOURS: u64 = 24;
pub const LUNAR_DAY_HOURS: f64 = 708.734;
pub const POLAR_CRATER_MIN_TEMP_K: f64 = 25.0;
pub const SUBSOLAR_MAX_TEMP_K: f64 = 390.0;
pub const GALACTIC_COSMIC_RAY_DOSE_MSV_DAY: f64 = 1.37;
pub mod environment;
pub mod exosphere;
pub mod geodata;
pub mod geology;
pub mod interactions;
pub mod lighting;
pub mod missions;
pub mod observation;
pub mod physics;
pub mod rendering;
pub mod resources;
pub mod surface;
pub mod temporal;
pub mod terrain;