use units::si

@name("Parsec")
@url("https://en.wikipedia.org/wiki/Parsec")
@metric_prefixes
@aliases(parsecs, pc: short)
unit parsec: Length = 648_000 / π × au

@name("Light-year")
@url("https://en.wikipedia.org/wiki/Light-year")
@metric_prefixes
@aliases(lightyears, ly: short, lyr: short)
unit lightyear: Length = 9_460_730_472_580_800 m

@name("Sidereal day")
@url("https://en.wikipedia.org/wiki/Sidereal_time#Sidereal_day")
@aliases(sidereal_days)
unit sidereal_day: Time = 86164.0905 s