In 1929 the International Astronomical Union defined the edges of the 88 official constellations. Roughly every 2,150 years the Sun's position at the time of the vernal equinox will have moved into a new zodiacal constellation. Traditionally this 25,800 year-long cycle is calibrated, for the purposes of determining astrological ages, by the perceived location of the Sun in one of the 12 zodiac constellations at the vernal (Spring) equinox, which corresponds to the moment the Sun is perceived as crossing the celestial equator, marking the start of spring in the Northern Hemisphere each year. The slow wobble of the Earth's rotation axis on the celestial sphere is independent of the diurnal rotation of the Earth on its own axis and the annual revolution of the Earth around the Sun. Īstrological ages are taken to be associated with the precession of the equinoxes. Based on Campion's summary, most published materials on the subject state that the Age of Aquarius arrived in the 20th century (29 claims), with the 24th century in second place with 12 claimants. Campion (1999) lists various references from mainly astrological sources for the start of the Age of Aquarius. Īstrologers do not agree on when the Aquarian age will start or even if it has already started. According to various astrologers' calculations, approximate dates for entering the Age of Aquarius range from 1447 CE (Terry MacKinnell) to 3597 CE (John Addey). A more accurate set of figures is 25,772 years for a complete cycle and 2,147.5 years per astrological age. This is only a rough calculation, as the length of time it takes for a complete precession is currently increasing. This average can be computed by dividing the Earth's 25,800 year gyroscopic precession period by 12, the number of zodiacal signs. The approximate 2,160 years for each age corresponds to the average time it takes for the vernal equinox to move from one constellation of the zodiac into the next. Therefore, the Age of Aquarius follows the Age of Pisces. Astrological ages proceed in the opposite direction. In Sun-sign astrology, the first sign is Aries, followed by Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricorn, Aquarius, and Pisces, whereupon the cycle returns to Aries and through the zodiacal signs again. There are various methods of calculating the boundaries of an astrological age. Astrologers maintain that an astrological age is a product of the Earth's slow precessional rotation and lasts for 2,160 years, on average (one Great Year equals 25,920-year period of precession / 12 zodiac signs = 2,160 years). The Age of Aquarius, in astrology, is either the current or forthcoming astrological age, depending on the method of calculation. Chakras, or energy centers, were added later. An Age of Aquarius symbol: Leonardo da Vinci's Vitruvian Man.
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