SphericalType.Metersval to_km : t -> floatTo and from kilometers.
val of_km : float -> tval to_mile : t -> floatTo and from the international mile.
val of_mile : float -> tval to_yard : t -> floatTo and from the international yard.
val of_yard : float -> tval to_ft : t -> floatTo and from the international foot.
val of_ft : float -> t