; Astronomical units and variables

Unit LIGHTYEAR      9.467305E15     Meter
Unit PARSEC         3.081284E16     Meter
Unit AU             149.6           Megakilometer   ; Astronomical Unit

let sirius_dist := 2.65 parsecs
let sun_dist := 150 megakilometers
let earth_to_sun := 150 megakilometers
let venus_to_sun := 108 megakilometers
let mercury_to_sun := 58 megakilometers
let mars_to_sun := 228 megakilometers
let jupiter_to_sun := 778 megakilometers
let saturn_to_sun := 1427 megakilometers
let uranus_to_sun := 2870 megakilometers
let neptune_to_sun := 4497 megakilometers
let pluto_to_sun := 5950 megakilometers
let moon_dist := 384 megameters
let andromeda_dist := 700 kiloparsecs

let sun_age := 4.6 gigayears
let cosmos_age := 15 gigayears