Function getAltitude

docs/app/js/sanddance-app.js:95825–95830

(hourAngle, latitudeInRadians, declination)

    return Math.atan2(Math.sin(H), Math.cos(H) * Math.sin(phi) - Math.tan(delta) * Math.cos(phi));
}
function getAltitude(hourAngle, latitudeInRadians, declination) {
    var H = hourAngle;
    var phi = latitudeInRadians;
    var delta = declination;
    return Math.asin(Math.sin(phi) * Math.sin(delta) + Math.cos(phi) * Math.cos(delta) * Math.cos(H));
}
function getSiderealTime(dates, longitudeWestInRadians) {
    return DEGREES_TO_RADIANS * (THETA0 + THETA1 * dates) - longitudeWestInRadians;
}