General ephemerides of the solar system bodies
To observe the solar system bodies from the Earth at a given moment, it is necessary to know their positions on
the celestial sphere. In a more general way, this implies to determine the considered body, Earth and Sun positions
related to a given time. For that we use a planetary theories which provide (analytical or numerical) description
of planets movement at the time of their revolution around the Sun.
In the same way there are natural satellites theories about their movements according to their central body.
For the asteroids and other small bodies of the solar system, it is following a numerical integration of their
movement that we can determine their orbit.
You can carry out calculations of positions ephemeris of any body of the solar system for one or more dates
spread over an time span of which you will indicate the initial date, the number of dates and the
step of calculation. The provided timescales are Terrestrial Time (TT) and the coordinated universal
Time (UTC). The planetary theories suggested are upon choice
VSOP87  and
DE405 and DE406 while natural satellites theories are
for Mars, L1 
for Jupiter, TASS 1.7
for Saturn and GUST86
for Uranus. For the Moon, the theory used is, according to case's, ELP2000-82
or ELP2000-82B or LE200
or LE403 
or LE405 or LE406.
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