Function getPosition

index.js:85–99

(date, lat, lng)

// calculates sun position for a given date and latitude/longitude
export function getPosition(date, lat, lng) {
    const lw = rad * -lng;
    const phi = rad * lat;
    const d = toDays(date);

    const c = sunCoords(toDaysTT(d)); // position series run on Terrestrial Time
    const H = siderealTime(d, lw) - c.ra; // sidereal time stays on UT
    const h = altitude(H, phi, c.dec);

    return {
        azimuth: azimuth(H, phi, c.dec),
        // apparent (refraction-corrected) altitude in degrees
        altitude: (h + astroRefraction(h)) / rad
    };
}

// sun times configuration (angle, morning name, evening name)
export const times = [