*What are the ephemerides and how do they help us?*
*What are the ephemerides?*
An ephemeris (plural: ephemerides; from the Greek word *ἐ**
φήμερος* *ephemeros* "daily") is a table of values that gives the positions
of astronomical objects in the sky at a given time or times. Different kinds
are used for astronomy and astrology. Even though this was also one of the
first applications of mechanical computers, an ephemeris will still often be
a simple printed table.
The position is given to astronomers in a spherical polar
coordinate system of right ascension and declination or to astrologer in
longitude along the zodiacal ecliptic, and sometimes declination.
Astrological positions may be given for either noon or midnight.
An astronomical ephemeris may also provide data on astronomical
phenomena of interest to astrologers and astronomers such as eclipses,
apparent retrogradation/planetary stations, planetary ingresses, sidereal
time, positions for the Mean and True nodes of the moon, the phases of the
Moon, and sometimes even the position(s) of Chiron, and other minor
celestial bodies. Astrologers also use other ephemerides that include tables
of imaginary celestial bodies, such as Lilith, a term they use variously for
the apogee of the Moon or the second focus of the Moon's orbit. Some
ephemerides also contain a monthly aspectarian, while others often include
the declination of the planets as well as their longitudes, right ascensions
or Cartesian coordinates.
The majority of astrologers study tropical astrology, involving
planetary positions referenced to the vernal (spring) equinox position along
the ecliptic (the equinox being the nexus of Earth's rotational plane and
Earth's orbital plane around the Sun). They use exactly the same referential
frame of the astronomers, except for a small minority of astrologers who
study sidereal astrology and use a different ephemeris, based on the
constellations.
Though astrology is and always has been geocentric, heliocentric
astrology is an emerging field; for this purpose a standard ephemeris cannot
be utilized, and because of this specialized heliocentric ephemerides must
be calculated and used instead of the default geocentric ephemerides that
are used in standard Western astrology to construct the astrological
chart/natal chart.
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