The Planetarium and Astronomical Calculator

angle apogee appear Aries ascending node attraction axis beginning body calculated called cause centre centuries circle Comets conjunction consequently continue dark degrees descending describes diameter difference direction discovered disk distance earth Eclipse equal equator EXAMPLE fall force fourth full Moon given gravity greater greatest half happen Heavens horizon Jupiter latitude least length less light LONDON longitude lunations March matter mean anomaly mean distance Mercury miles millions minutes month Moon's Moon's orbit motion move namely nearer nearest nearly never node observer once opposite orbit passes path performs period planet pole proportion quarter rays remainder Required respect revolution rise round satellites Saturn seconds seen semi-diameter shadow side signs Solar space stars Style subtract Sun and Moon Sun's mean surface System Table telescope third thousand Tides tion true Venus visible whole