pracstro 1.1.1

A simple astronomy library
Documentation 
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use pracstro::{moon, time};

const HALFMON: f64 = 14.76529434;
const EMOJIS: [&str; 8] = ["🌑", "🌒", "🌓", "🌔", "🌕", "🌖", "🌗", "🌘"];
//const SEMOJI: [&str; 8] = ["🌑", "🌘", "🌗", "🌖", "🌕", "🌔", "🌓", "🌒"];
const PNAMES: [&str; 8] = [
    "New",
    "Waxing Crescent",
    "First Quarter",
    "Waxing Gibbous",
    "Full",
    "Waning Gibbous",
    "Last Quarter",
    "Waning Crescent",
];

fn phaseidx(ilumfrac: f64, mage: f64) -> usize {
    let half: bool = mage > HALFMON;
    match (ilumfrac, half) {
        (0.00..0.04, _) => 0,
        (0.96..1.00, _) => 4,
        (0.46..0.54, true) => 6,
        (0.46..0.54, false) => 2,
        (0.54..0.96, true) => 5,
        (0.54..0.96, false) => 3,
        (_, true) => 7,
        (_, false) => 1,
    }
}

fn main() {
    let p = (
        moon::MOON.illumfrac(time::Date::now()),
        moon::MOON.phaseage(time::Date::now()),
    );
    println!(
        "{} {} ({:.2}%)",
        PNAMES[phaseidx(p.0, p.1)],
        EMOJIS[phaseidx(p.0, p.1)],
        p.0 * 100.0
    );
}