Function astroRefraction

index.js:55–60

(h)

}

function astroRefraction(h) {
    if (h < 0) h = 0; // formula valid for positive altitudes only

    // Meeus 16.4: 1.02 / tan(h + 10.26 / (h + 5.10)), h in degrees, arcmin result — folded into rad
    return 0.0002967 / tan(h + 0.00312536 / (h + 0.08901179));
}

// general sun calculations