When the twelve zodiac signs are part of the year calendar in combination with the four elements, they are traditionally called the twelve Earthly Branches. The Chinese zodiac follows the lunisolar Chinese calendar  and thus the "changeover" days in a month when one sign changes to another sign vary each year. The following are the twelve zodiac signs in order.
The five elements operate together with the twelve animal signs in a year calendar. The five elements appear in the calendar in both their yin and yang forms and are known as the ten Celestial stems.
When trying to calculate the relevant year of the cycle in relation to the Gregorian calendar , an easy rule to follow is that years that end in an even number are Yang representing masculine, active and light , those that end with an odd number are Yin representing feminine, passive and darkness. From Wikipedia, the free encyclopedia. Not to be confused with Constellations. For differences between systems, see Sidereal and tropical astrology and Zodiac. Main article: Zodiac. Further information: Babylonian astrology , Hellenistic astrology , and Ancient Egyptian astronomy.
Main article: Triplicity. Further information: Classical element.
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See also: Domicile astrology. This section needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Further information: Decans. Further information: Hindu astrology. Main article: Nakshatra.
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Main article: Chinese zodiac. The cosmic perspective 4th ed. Proceedings of the International Astronomical Union. Archived from the original on Retrieved Be Your Own Astrologer. London: Pan Books. Astro Essentials. Journal for the Study of Religion, Nature and Culture.
Retrieved July 18, Logos, Asaa — Astrological Dictionary — RA Publications. Retrieved 5 January History of astrology Astrology and science Astrology and astronomy Musica universalis Tetrabiblos.
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Astrologers by nationality List of astrologers. Astrology and science Archaeoastronomy Astrological age Astrological aspect Astrological symbols Astrology and the classical elements Cultural influence of astrology Planets in astrology Zodiac.
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The Zodiac. Chinese zodiac. Cat Rabbit. Sheep Goat. It is unclear when Indians became aware of the precession of the equinoxes, but Bhaskara 2 's 12th-century treatise Siddhanta Shiromani gives equations for measurement of precession of equinoxes, and says his equations are based on some lost equations of Suryasiddhanta plus the equation of Munjaala. The discovery of precession is attributed to Hipparchus around BC.
Ptolemy quotes from Hipparchus' now lost work entitled "On the Displacement of the Solstitial and Equinoctial Points" in the seventh book of his 2nd century astronomical text, Almagest , where he describes the phenomenon of precession and estimates its value. The principle of the vernal point acting as the first degree of the zodiac for Greek astronomers is also described in the 1st century BC astronomical text of Geminus of Rhodes.
Geminus explains that Greek astronomers of his era associate the first degrees of the zodiac signs with the two solstices and the two equinoxes, in contrast to the older Chaldean Babylonian system, which placed these points within the zodiac signs. Ptolemy also demonstrates that the principle of the tropical zodiac was well known to his predecessors within his astrological text, the Tetrabiblos , where he explains why it would be an error to associate the regularly spaced signs of the seasonally aligned zodiac with the irregular boundaries of the visible constellations:.
These events can be useful, for example, to estimate the cross-sectional dimensions of a minor planet , or check a star for a close companion. The Sun's placement upon the vernal equinox, which occurs annually around 21 March, defines the starting point for measurement, the first degree of which is historically known as the " first point of Aries ".
Zodiac signs have never been used to determine the boundaries of astronomical constellations that lie in the vicinity of the zodiac, which are, and always have been, irregular in their size and shape. The use of the zodiac as a means to determine astronomical measurement remained the main method for defining celestial positions by Western astronomers until the Renaissance, at which time preference moved to the equatorial coordinate system , which measures astronomical positions by right ascension and declination rather than the ecliptic-based definitions of celestial longitude and celestial latitude.
The word "zodiac" is also used in reference to the zodiacal cloud of dust grains that move among the planets, and the zodiacal light that originates from their scattering of sunlight. In Unicode, the symbols of zodiac signs are encoded in block "Miscellaneous Symbols": . From Wikipedia, the free encyclopedia.
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This is the latest accepted revision , reviewed on 5 October For the East Asian zodiac based on the Jovian orbital cycle, see Chinese zodiac. For other uses, see zodiac disambiguation. Further information: Former constellations. Further information: Babylonian star catalogues and MUL. Main article: Astrological sign. Further information: Axial precession , Epoch astronomy , Sidereal and tropical astrology , Astrological age , and Ayanamsa. Astronomical symbols Chinese zodiac Circle of stars Cusp astrology Elements of the zodiac.
Oxford Dictionaries. Oxford University Press. Retrieved 19 September The Signs of the Zodiac. Wilcox, London, p. See also Lankford, John; Rothenberg, Marc History of Astronomy: An Encyclopedia. The Almagest. Translated and annotated by G. Toomer ; with a foreword by Owen Gingerich. The introduction of the uniform zodiac", Archive for History of Exact Sciences , 64 6 : —, doi : The Mesopotamian traditions. Astronomical Data Service. Page Lennart Geminos's Introduction to the Phenomena.
Princeton University Press. Ptolemy's Tetrabiblos.
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Astrology Classics. Project Hindsight.