theory, e.g. in geocentric places because the
observations are made from the surface of the earth instead of the
centre, or in heliocentric places because observations are made from
the earth and not from the sun.
Perigee: The point in the orbit of a celestial body when it is nearest
to the earth.
Precession: Owing to the slow motion of the earth's pole around the pole
of the ecliptic, the equator cuts the ecliptic a little earlier
every year, so that the equinox each year slightly precedes, with
reference to the stars, that of the previous year.
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