Except for and , the vernal equinox has started on 20 March since , and is projected to until Because the Earth's axis is at an angle, some signs take longer to rise than others, and the farther away from the equator the observer is situated, the greater the difference. Thus, signs are spoken of as "long" or "short" ascension. The zodiac system was developed in Babylonia , some 2, years ago, during the " Age of Aries ".
Contemporary use of the coordinate system is presented with the choice of interpreting the system either as sidereal , with the signs fixed to the stellar background , or as tropical , with the signs fixed to the point vector of the Sun at the March equinox.
Western astrology takes the tropical approach, whereas Hindu astrology takes the sidereal one. This results in the originally unified zodiacal coordinate system drifting apart gradually, with a clockwise westward precession of 1. For the tropical zodiac used in Western astronomy and astrology, this means that the tropical sign of Aries currently lies somewhere within the constellation Pisces " Age of Pisces ".
The sidereal coordinate system takes into account the ayanamsa , ayan meaning transit or movement , and amsa meaning small part , i. 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.
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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. 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.
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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. Your principal governing element is Earth. This element works closely with Fire, Water, and Air to give your life its complete meaning. December 27 zodiac people are on the Sagittarius-Capricorn Astrological Cusp. We refer to this as the Cusp of Prophecy. The planets Jupiter and Saturn rule supreme over the lives of these Cuspers. As such, you have the focus you need to succeed in life. The influence of these two planets in your life is quite robust.
For example, you are industrious as well as courageous. This means that you make sizable strides in life. In fact, you are way ahead of your acquaintances. You have the ability to rise fast in any setup. You are not afraid to kick some butt if it gets the work done. Your focus on doing the right things will see you go far in life. The Cusp of Prophecy has considerable in your life. This means that you are able to make the right moves as far as making investments is concerned. Your astrological chart indicates that your health is good.
However, you need to be wary of possible infections in your skin, bones, and lower body. December 27 zodiac people are very trustworthy as lovers. You infuse a lot of sense into the relationship.
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- Love and Compatibility for December 27 Zodiac?
Otherwise, you become unpredictable, especially when someone injures your feelings. You are as sincere as you are elegant. These are very strong qualities, and they have won you many admirers of both sexes. They are a strong magnet for anyone who comes into contact with you. Energetic, loyal, and dependable partners have a special place in your heart. You feel a deep emotional connection with these people. As such, they are your ideal partners.
You can get such a lover from amongst the Cancer, Taurus, and Virgo. You are highly compatible with these natives. Thus, your relationship would be chaotic and disastrous. Those born on December 27 are very pragmatic. It never differs more than a day in each direction.
Again using Aquarius as an example, its start is almost always on the 20th of January, and the end of it on the 18th or 19th of February. People born on other dates need not be concerned. Here are the cusp dates for all the twelve Zodiac signs, where I include the possible starting and ending dates for each Zodiac sign.
Aries Dates. English name: The Bull. Taurus Dates. English name: The Twins. Gemini Dates.
Zodiac Sign Dates of Birth
English name: The Crab. Cancer Dates. English name: The Lion. Leo Dates. English name: The Maiden or Virgin. Virgo Dates. English name: The Scales. Libra Dates. English name: The Scorpion. Scorpio Dates.