marss 0.0.3

Mars celestial simulation crate for the MilkyWay SolarSystem workspace
Documentation 
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pub struct ThermalCycle {
    pub daytime_max_k: f64,
    pub nighttime_min_k: f64,
    pub thermal_inertia: f64,
    pub latitude_deg: f64,
}

impl ThermalCycle {
    pub fn equatorial_summer() -> Self {
        Self {
            daytime_max_k: 293.0,
            nighttime_min_k: 175.0,
            thermal_inertia: 300.0,
            latitude_deg: 0.0,
        }
    }

    pub fn equatorial_winter() -> Self {
        Self {
            daytime_max_k: 250.0,
            nighttime_min_k: 170.0,
            thermal_inertia: 300.0,
            latitude_deg: 0.0,
        }
    }

    pub fn polar_summer() -> Self {
        Self {
            daytime_max_k: 200.0,
            nighttime_min_k: 150.0,
            thermal_inertia: 250.0,
            latitude_deg: 80.0,
        }
    }

    pub fn polar_winter() -> Self {
        Self {
            daytime_max_k: 150.0,
            nighttime_min_k: 130.0,
            thermal_inertia: 250.0,
            latitude_deg: 80.0,
        }
    }

    pub fn temperature_swing_k(&self) -> f64 {
        self.daytime_max_k - self.nighttime_min_k
    }

    pub fn temperature_at_phase(&self, phase: f64) -> f64 {
        let mean = (self.daytime_max_k + self.nighttime_min_k) / 2.0;
        let amp = (self.daytime_max_k - self.nighttime_min_k) / 2.0;
        mean + amp * (2.0 * std::f64::consts::PI * (phase - 0.25)).cos()
    }

    pub fn thermal_stress_mpa(&self) -> f64 {
        let alpha = 8e-6;
        let youngs = 50e9;
        alpha * youngs * self.temperature_swing_k() / 1e6
    }

    pub fn thermal_inertia_units(&self) -> f64 {
        self.thermal_inertia
    }
}

pub fn surface_type_from_thermal_inertia(ti: f64) -> &'static str {
    if ti < 100.0 {
        "Fine dust"
    } else if ti < 250.0 {
        "Sand / duricrust"
    } else if ti < 600.0 {
        "Gravel / cemented soil"
    } else if ti < 1200.0 {
        "Bedrock"
    } else {
        "Ice / exposed rock"
    }
}

pub fn global_mean_thermal_inertia() -> f64 {
    225.0
}