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, Body.Pluto,
Body.SSB, or Body.EMB.
Also allowed to be a user-defined star created by DefineStar.
The date and time for which the body's position is to be calculated.
Calculates a vector from the center of the Sun to the given body at the given time.
Calculates heliocentric (i.e., with respect to the center of the Sun) Cartesian coordinates in the J2000 equatorial system of a celestial body at a specified time. The position is not corrected for light travel time or aberration.