Function getDeclination

docs/app/js/sanddance-app.js:95815–95818

(eclipticLongitude, b)

    return Math.atan2(Math.sin(lambda) * Math.cos(e) - Math.tan(b) * Math.sin(e), Math.cos(lambda));
}
function getDeclination(eclipticLongitude, b) {
    var lambda = eclipticLongitude;
    return Math.asin(Math.sin(b) * Math.cos(e) + Math.cos(b) * Math.sin(e) * Math.sin(lambda));
}
function getAzimuth(hourAngle, latitudeInRadians, declination) {
    var H = hourAngle;
    var phi = latitudeInRadians;