One of the following values:
Body.Sun, Body.Moon, Body.Mercury, Body.Venus,
Body.Earth, Body.Mars, Body.Jupiter, Body.Saturn,
Body.Uranus, Body.Neptune, or Body.Pluto.
Also allowed to be a user-defined star created with DefineStar.
The date and time for which the body's position is to be calculated.
Pass true to correct for
aberration,
or false to leave uncorrected.
Calculates a vector from the center of the Earth to the given body at the given time.
Calculates geocentric (i.e., with respect to the center of the Earth) Cartesian coordinates in the J2000 equatorial system of a celestial body at a specified time. The position is always corrected for light travel time: this means the position of the body is "back-dated" based on how long it takes light to travel from the body to an observer on the Earth. Also, the position can optionally be corrected for aberration, an effect causing the apparent direction of the body to be shifted based on transverse movement of the Earth with respect to the rays of light coming from that body.