•Astro Gold uses the Swiss Ephemeris for state of the art precision in astronomical calculations - ephemeris range 1200 BC to 2400 AD.
•Vulcan is a hypothetical planet, and there is no officially accepted ephemeris for the calculation of its position. Astro Gold uses the orbiting version of L.H.Weston.
•The Black Moon Lilith is the empty focal point of the Moon’s orbit around the earth, which is also the apogee of the Moon’s orbit. It is the true (osculating) apogee that is used in Astro Gold.
•The Moon's nodes are the true Nodes.
