jupiters 0.0.3

Jupiter celestial simulation crate for the MilkyWay SolarSystem workspace
Documentation 
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const JUPITERAXIALTILTDEG: f64 = 3.13;
const JUPITERORBITALPERIODDAYS: f64 = 4332.59;

pub struct Seasons {
    pub juliandate: f64,
}

impl Seasons {
    pub fn new(juliandate: f64) -> Self {
        Self { juliandate }
    }

    pub fn jupitersolarlongitudedeg(&self) -> f64 {
        let j2000epoch = 2451545.0;
        let days = self.juliandate - j2000epoch;
        let meananomaly = (18.818 + 360.0 * days / JUPITERORBITALPERIODDAYS) % 360.0;
        let meananomaly_rad = meananomaly.to_radians();
        let ecc: f64 = 0.0489;
        let trueanomaly = meananomaly
            + (2.0 * ecc - ecc.powi(3) / 4.0) * meananomaly_rad.sin().to_degrees()
            + (5.0 / 4.0) * ecc.powi(2) * (2.0 * meananomaly_rad).sin().to_degrees();
        let perihelong = 14.75;
        (trueanomaly + perihelong + 360.0) % 360.0
    }

    pub fn subsolarlatitudedeg(&self) -> f64 {
        let ls = self.jupitersolarlongitudedeg();
        let tilt = JUPITERAXIALTILTDEG.to_radians();
        (tilt.sin() * ls.to_radians().sin()).asin().to_degrees()
    }

    pub fn seasonname(&self) -> &'static str {
        let ls = self.jupitersolarlongitudedeg();
        match ls {
            l if l < 90.0 => "Northern Spring",
            l if l < 180.0 => "Northern Summer",
            l if l < 270.0 => "Northern Autumn",
            _ => "Northern Winter",
        }
    }

    pub fn daylighthours(&self, latdeg: f64) -> f64 {
        let decl = self.subsolarlatitudedeg().to_radians();
        let lat = latdeg.to_radians();
        let cosh = -(lat.tan() * decl.tan());
        if cosh < -1.0 {
            return 9.925;
        }
        if cosh > 1.0 {
            return 0.0;
        }
        let ha = cosh.acos();
        9.925 * ha / std::f64::consts::PI
    }

    pub fn insolationfactor(&self, latdeg: f64) -> f64 {
        let lat = latdeg.to_radians();
        let decl = self.subsolarlatitudedeg().to_radians();
        let zenithcos = lat.cos() * decl.cos() + lat.sin() * decl.sin();
        let distanceau = 5.2044;
        zenithcos.max(0.0) / (distanceau * distanceau)
    }
}