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Astro*Dictionary by Michael Erlewine

 

 

 

 

10 articles for "Tropical"

Tropical Astrology [Munkasey M.]

That branch of astrology which uses a movingreference point to determine the location of the Aries Point. This moving reference point is determined each year from where the Sun crosses the Equator, going North.

See also:
♦ Precession ♦ Sidereal Astrology
Tropical Day [Astro*Index]

A Civil day.

See also:
♦ Time ♦ Day
Tropical Day [Munkasey M.]

A Solar or clock day of 24 hours in length.

See also:
♦ Time ♦ Day
Tropical Signs [Astro*Index]

Cancer and Capricorn.

See also:
♦ Equinoctal Signs
Tropical Signs [DeVore]

Cancer and Capricorn. (v. Signs)

See also:
♦ Equinoctal Signs ♦ Signs
Tropical Year [Astro*Index]

The time between successive passings of the Sun through the Vernal point. Equals 365.24220 days = 365d05h48m46s.

See also:
♦ Calendar ♦ Intercalary Month
Tropical Year [Munkasey M.]

A year of 365 Days, 5 Hours, 48 Minutes, and 4.5 Seconds (T=-365.2417187 Days). This is the length of time that it takes for the Sun to pass from one Vernal Equinox to the next Vernal Equinox.

See also:
♦ Calendar ♦ Intercalary Month
Tropical Year [DeVore]

The Solar Year; the period of 365d, 5h, 48m, 4.53s, during which the Sun's centre passes from one Vernal Equinox to the next. Because of the precession, it is shorter than the Sidereal Year by 20m, 23.5s.

See also:
♦ Calendar ♦ Intercalary Month
Tropical Zodiac [Astro*Index]

1. The coordinate system which measures Celestial Longitude eastward along the Ecliptic, beginning with the Vernal Point, and measures Celestial Latitude along great circles perpendicular to the Ecliptic. In this system, Tropical Aries begins at the Vernal Point. Also called the Hipparchus Tropical Zodiac.

2. No less than five Tropical Zodiacs existed during the Greco-Roman period. Each placed the Vernal Point in various degrees of their respective 'sign' of Aries:

ARI 15° - Eudoxus of Cnidus
ARI 12° - Cleostratus of Tenedos
ARI 10° - Naburiannu
ARI 08° - Kidinnu (Greek: Cidenas)
ARI 00° - Hipparchus (and Ptolemy)

By far, the most popular of these was that of Kidinnu (ARI 08°). The value used by Hipparchus (ARI 00°), which has become the modern Tropical Zodiac, was prefered only by Posidonius, Geminus (his pupil), and Claudius Ptolemy. The confusion which existed among the Greeks on these assignments is clear from their written accounts, and demonstrates their lack of knowledge of more ancient Egyptian and Babylonian astrology. —or A coordinate system which rotates with respect to the stars. Named for the Tropics of Cancer and Capricorn. Longitude is measured from the Vernal Point, which moves westward among the stars at a rate of about 1° each 72 years. No less than 5 Tropical Zodiacs were used by Greek astrologers.

See also:
♦ Tropic of Capricorn ♦ Zodiac ♦ Sidereal Zodiac ♦ Ecliptic ♦ Coordinate System ♦ Vernal Point ♦ Celestial Longitude ♦ Celestial Latitude ♦ Great Circle ♦ Hipparchus Tropical Zodiac ♦ Posidonius ♦ Geminus ♦ Babylonian Astrology ♦ Tropic of Cancer ♦ Egyptian Astrology
Tropical Zodiac [Prima]

One of the two basic zodiac systems (the other is the sidereal zodiac), it is the zodiac traditionally used by Western astrologers.

In the tropical ("seasonal") zodiac, the cycle of the 12 signs is measured in longitude along the ecliptic, with the first sign (Aries) starting at the vernal point (our spring equinox).

Two thousand years ago, our spring equinox coincided with the beginning of the sidereal zodiac (the Aries constellation); however, this is no longer so, due to the precession of the equinoxes.

See also:
♦ Tropic of Capricorn ♦ Zodiac ♦ Sidereal Zodiac ♦ Ecliptic ♦ Coordinate System ♦ Vernal Point ♦ Celestial Longitude ♦ Celestial Latitude ♦ Great Circle ♦ Hipparchus Tropical Zodiac ♦ Posidonius ♦ Geminus ♦ Babylonian Astrology ♦ Tropic of Cancer ♦ Egyptian Astrology

 

Astro*Index Copyright © 1997 Michael Erlewine

 

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