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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- Zodiac - Wikipedia!
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. Astrology Classics. Project Hindsight. Retrieved 4 July Hinduism: An Alphabetical Guide.source link
January 28 Zodiac - Complete Birthday Horoscope & Personality Profile
Penguin Books India. London: Board of Longitude, Patrick Grim ed. Philosophy of science and the occult. Ptolemy's Catalogue of Stars: a revision of the Almagest. Carnegie Institution of Washington, Catesby Taliaferro ed. Ptolemy refers to the constellation as Septentarius "the serpent holder".
October The Observatory. Bibcode : Obs He later issued a statement to say he had not reported that the zodiac ought to include 13 signs instead of 12, but was only mentioning that there were 13 constellations; reported in Mad Astronomy : Why did your zodiac sign change? International Planetarium Society.
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Retrieved 21 March The date in other time zones may vary. The Unicode Standard. History of the Zodiac. Sophia Academic Press. Lee T. Random House, Inc. Retrieved 21 May Retrieved 7 May Retrieved 6 March Rubie Zodiac category. The Zodiac. Ancient Greek astronomy.
Babylonian astronomy Egyptian astronomy. Medieval European science Indian astronomy Medieval Islamic astronomy. History of astrology Astrology and science Astrology and astronomy Musica universalis Tetrabiblos. 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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If your birthday falls on the Virgo side, your logical perfectionism is softened by a dreamy romanticism. If your sun is on the Libra side, you'll be more discerning about the kind of people you invite into your life, and you may have a bit of a judgmental streak in you. You're likely to be a strict enforcer because of your Libran desire for everything to be fair in your life. If your birthday is on the Libra side, you combine your Libran ability to look at every side of a situation with the Scorpio's ability to get down to the bottom of what motivates people. However, you may be in denial about everything you know since Libras want to think the best of others.
If your birthday is on the Scorpio side, you're more of an idealist than a typical Scorpio, a sign that is more skeptical of others. You feel things on an incredibly deep level but also have the ability to look on the bright side. If your birthday is on the Scorpio side, your dark moods are relieved somewhat with an ability to remain optimistic about the future, or at least to keep a sense of humor about it. If your birthday falls on the Sagittarius side, you appear to others as having a bright outlook on the world.
But deep down, you have an emotional understanding of what the fuck is really up with people. You know it's not all sunshine and roses out there.
The Most Compatible Astrological Signs
If your birthday is on the Sagittarius side, your impulsive need for freedom gets reigned in by a natural practicality and desire for a stable and responsible life. If you were born on the Capricorn side, you're more likely to decide to go after a career that'll provide you with a solid financial future and the opportunity to make the world a better place.
Instead of just wanting to fit in in an orthodox way, by say, climbing to the top of a corporate ladder, you're likely to want to stand out in a unique way. If you were born on the Aquarius side, you take everything a little more seriously than the typical Aquarius, a sign that usually has the ability to remain more detached. You feel an innate sense of responsibility in life, and you take your responsibilities seriously.
If your birthday is on the Aquarius side, you are more likely to have a hard time distinguishing your own thoughts from your daydreams, as the two are likely to be fused together. If your birthday falls on the Pisces side, you're able to visualize your dreams and intuitions more sharply and see your goals more clearly. If your birthday is on the Pisces side, you'll find that you are bolder than a typical Pisces, ready to take your dreams and turn them into action. Where most Pisces prefer to just dream about their goals, you want to actually make something out of them. If your birthday is on the Aries side, you'll find you're a little more sensitive to others than a typical Aries, and you're slightly less sure of yourself.