

const AU = 1.495978700e11     # Astronomical Unit [m]
const G = 6.6740831e-11       # Gravitational constant [m^3/kg/s^2]
const GM☉ = 1.32712440018e20
const M☉ = GM☉ / G
const SOLAR_CONST = 1366.0    # Solar constant, Φ☉ [W/m^2]
const c₀ = 299792458.0        # speed of light [m/s]
const σ_SB = 5.670374419e-8   # Stefan–Boltzmann constant [W/m^2/K^4]

const GM_Mercury = 2.2032e13
const GM_Venus   = 3.24859e14
const GM_Earth   = 3.986004418e14
const GM_Moon    = 4.9048695e12
const GM_Mars    = 4.282837e13
const GM_Ceres   = 6.26325e10
const GM_Jupiter = 1.26686534e17
const GM_Saturn  = 3.7931187e16
const GM_Uranus  = 5.793939e15
const GM_Neptune = 6.836529e15
const GM_Pluto   = 8.71e11
const GM_Eris    = 1.108e12

const M_Mercury = GM_Mercury / G
const M_Venus   = GM_Venus   / G
const M_Earth   = GM_Earth   / G
const M_Moon    = GM_Moon    / G
const M_Mars    = GM_Mars    / G
const M_Ceres   = GM_Ceres   / G
const M_Jupiter = GM_Jupiter / G
const M_Saturn  = GM_Saturn  / G
const M_Uranus  = GM_Uranus  / G
const M_Neptune = GM_Neptune / G
const M_Pluto   = GM_Pluto   / G
const M_Eris    = GM_Eris    / G
