The ancient Babylonians were smart enough to map the twinkling constellations and the movement of the sun in and out of them, but they were yet to figure out the concept of 'precession'. To put it simply, it refers to the change in the direction of the earth's rotational axis in relation to fixed stars. This change occurs because the earth not just rotates on its axis but also wobbles - like a spinning top. This is because of the tilt in the earth's rotational axis resulting from unequal gravitational forces exerted on it by the sun and the moon.
In addition to rotation,the earth's axis also exhibits an extremely slow gyroscopic motion. If observed from the top of the North Pole, precession makes the tip of the earth's rotational axis trace a circle. And it takes 26, years to complete one such circle.http://niluxegiho.gq
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The importance of precession in astrology stems from the fact that the angle of the tilt of earth's axis on the first day of spring in the northern hemisphere is taken as the 'zero point', or the starting of the zodiac. Which means that from 0 degree to 30 degrees is Aries, followed by Taurus between 30 to 60 degrees, and so on.
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Now, since this reference point has moved over the years due to precession , the subsequent position of the rest of the zodiac has too. Therefore, it is important to factor in the precession of the earth's axis to know your 'correct' sun sign. However, western astrologers have refrained from doing so and continue to refer to the zodiac based on the placement of stars millions of years ago. If precession is taken into account,it throws the zodiac completely out of whack.
Take this for a reality check: the sun sign of people born between June 22 and July 20 is not Cancer but Gemini. See The Real Sun Signs As if this was not enough to shake your belief, science deals another blow to the zodiac system in the shape of Ophiucus, or the serpent bearer -- the 13th constellation. It seems that this group of stars escaped the probing eyes of the Babylonians as they divided the sky into 12 compartments. It, therefore, does not find a mention in western astrology.
If you were born between November 30 and December 17, your sun sign is Ophiucus and not Saggitarius. If indeed stars speak then they have been telling lies.
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Perhaps now you'll understand why your outspoken Arian self never got along with your partner's Saggitarian spontaneity though Goodman promised smouldering chemistry between the two signs. Goodman,it seems,is just as random about predicting the compatibility of two people as your family panditji or astrologer are even though they claim to be more accurate. Indian astrologers make birth charts kundlis and predictions by tracing the position of a constellation, or nakshatra, in the night sky and then deducting 23 degrees the angle of tilt of the earth's axis from it to get its "exact" position.
Indians do take precession into consideration. Even though other planets are there,we don't count their influence on your life because at that precise moment they are retrograde or not visible to the naked eye," explains astrologer Pandit Ajai Bhambi who has just come out with the book Vedic Sun Signs. Because Indians deduct 23 degrees from the visible position of a constellation,it translates into a gap of 23 days between sun signs in western zodiac and desi ones.
You have to bear in mind, though, that it may be erroneous to believe you are an Aries even in the western scheme of things if you are born on March 24 - the point exactly that anti-astrologers are trying to make. When TOI-Crest approached some western astrologers to explain these obvious discrepancies, none was able to do so. Marjorie Orr,a well-known astrologer whose daily predictions are carried in a host of magazines offered this: "The earth does tilt on its axis and the line through the centre of the earth has moved roughly from the constellation of Pisces into the constellation of Aquarius though the start and finish dates are difficult to pinpoint.
Orr used to be an award-winning journalist who later turned to psychotherapy and astrology. But what she says makes little sense. Even as you struggle to understand what it could possibly mean,he throws his latest predictions at you. On July 11,he says,he foretold in a city paper that Spain will score a goal in the last 11 minutes and win the world cup. However, Babylonian techniques of observational measurements were in a rudimentary stage of evolution.
In Babylonian astronomical diaries , a planet position was generally given with respect to a zodiacal sign alone, less often in specific degrees within a sign. Knowledge of the Babylonian zodiac is also reflected in the Hebrew Bible ; E. Bullinger interpreted the creatures appearing in the book of Ezekiel as the middle signs of the 4 quarters of the Zodiac,   with the Lion as Leo , the Bull is Taurus , the Man representing Aquarius and the Eagle representing Scorpio.
Martin and others have argued that the arrangement of the tribes around the Tabernacle reported in the Book of Numbers corresponded to the order of the Zodiac, with Judah , Reuben , Ephraim , and Dan representing the middle signs of Leo, Aquarius, Taurus, and Scorpio, respectively.
Such connections were taken up by Thomas Mann , who in his novel Joseph and His Brothers attributes characteristics of a sign of the zodiac to each tribe in his rendition of the Blessing of Jacob. Hellenistic astrology derived in part from Babylonian and Egyptian astrology. The Dendera zodiac , a relief dating to ca. The earliest extant Greek text using the Babylonian division of the zodiac into 12 signs of 30 equal degrees each is the Anaphoricus of Hypsicles of Alexandria fl.
Hipparchus's lost work on precession never circulated very widely until it was brought to prominence by Ptolemy,  and there are few explanations of precession outside the work of Ptolemy until late Antiquity, by which time Ptolemy's influence was widely established. The Hindu zodiac uses the sidereal coordinate system , which makes reference to the fixed stars. The Hindu zodiac, being sidereal, does not maintain this seasonal alignment, but there are still similarities between the two systems. The Hindu zodiac signs and corresponding Greek signs sound very different, being in Sanskrit and Greek respectively, but their symbols are nearly identical.
This included magical uses of the zodiac, as found, e. Mughal king Jahangir issued an attractive series of coins in gold and silver depicting the twelve signs of the Zodiac. An example of the use of signs as astronomical coordinates may be found in the Nautical Almanac and Astronomical Ephemeris for the year The "Longitude of the Sun" columns show the sign represented as a digit from 0 to and including 11 , degrees from 0 to 29, minutes, and seconds.
The zodiac symbols are Early Modern simplifications of conventional pictorial representations of the signs, attested since Hellenistic times. But note that the Sanskrit and the name equivalents after c. Also, the "English translation" isn't usually used by English speakers. Latin names are standard English usage. The zodiacal signs are distinct from the constellations associated with them, not only because of their drifting apart due to the precession of equinoxes but also because the physical constellations take up varying widths of the ecliptic, so the Sun is not in each constellation for the same amount of time.
The zodiacal signs are an abstraction from the physical constellations, and each represent exactly one 12th of the full circle, or the longitude traversed by the Sun in about The path of the Sun passes through 13 constellations recognized by ancient Babylonian, Greek, and Roman astronomers including in Ptolemy 's Almagest   and the modern International Astronomical Union.
Because the Babylonians had a month lunar calendar, they chose and divided up the year evenly. The 13th was left out: Ophiuchus , the bottom part of which interjects between Scorpio and Sagittarius. Occasionally this difference between the astronomical constellations and the astrological signs is mistakenly reported in the popular press as a "change" to the list of traditional signs by some astronomical body like the IAU, NASA , or the Royal Astronomical Society.
For example, in drawing a distinction between astrology and scientific astronomy, NASA notes that "No one has shown that astrology can be used to predict the future or describe what people are like based on their birth dates. Some "parazodiacal" constellations are also touched by the paths of the planets, leading to counts of up to 25 "constellations of the zodiac". Some other constellations are also mythologically associated with the zodiacal ones: Piscis Austrinus , The Southern Fish, is attached to Aquarius. In classical maps, it swallows the stream poured out of Aquarius' pitcher, but perhaps it formerly just swam in it.
Aquila , The Eagle, was possibly associated with the zodiac by virtue of its main star, Altair.
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The following table compares the Gregorian dates on which the Sun enters:. The theoretical beginning of Aries is the moment of vernal equinox , and all other dates shift accordingly. The precise Gregorian times and dates vary slightly from year to year as the Gregorian calendar shifts relative to the tropical year.
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. 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.
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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": .
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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. 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.
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