use-astronomical-constants 0.1.0

Reusable astronomical constants for RustUse
Documentation 
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#![forbid(unsafe_code)]

//! Reusable astronomical constants expressed as plain `f64` values.

/// Exact astronomical unit by IAU definition, in meters.
pub const ASTRONOMICAL_UNIT: f64 = 149_597_870_700.0;

/// Conventional light-year distance for one Julian year of light travel, in meters.
pub const LIGHT_YEAR: f64 = 9.460_730_472_580_8e15;

/// Approximate parsec distance, in meters.
pub const PARSEC: f64 = 3.085_677_581_491_367e16;

/// Measured solar mass, in kilograms.
pub const SOLAR_MASS: f64 = 1.988_47e30;

#[cfg(test)]
mod tests {
    use super::{ASTRONOMICAL_UNIT, LIGHT_YEAR, PARSEC, SOLAR_MASS};

    #[test]
    fn larger_astronomical_distances_exceed_smaller_ones() {
        assert!(LIGHT_YEAR > ASTRONOMICAL_UNIT);
        assert!(PARSEC > LIGHT_YEAR);
    }

    #[test]
    fn representative_stellar_mass_is_positive() {
        assert!(SOLAR_MASS > 0.0);
    }

    #[test]
    fn parsec_exceeds_astronomical_unit() {
        assert!(PARSEC > ASTRONOMICAL_UNIT);
    }
}