Function fromJulian

index.js:13–15

(j)

const earthRadius = 6378.14; // equatorial radius in km, for the Moon's topocentric parallax

function fromJulian(j) {
    return new Date((j + 0.5 - J1970) * dayMs);
}
function toDays(date) {
    return date.valueOf() / dayMs - 0.5 + J1970 - J2000;
}