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.
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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.
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.
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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 10 November For the East Asian zodiac based on the Jovian orbital cycle, see Chinese zodiac.
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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.
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Princeton University Press. Ptolemy's Tetrabiblos. Astrology Classics. Project Hindsight. Retrieved 4 July Hinduism: An Alphabetical Guide. Your seniors will also cooperate with you during this phase. For people in business, the beginning of the week will see moderate growth in their companies. However, the end of the week may be challenging. You are advised to keep calm and deal with patience. On the personal front, things with your family will be great.
Your love and dedication will be reciprocated. This week shall be a week full of emotional distress and uncertainties. Your indecisive nature shall not allow you to derive proper conclusions to pending matters. Meditation will help you overcome any negative feelings that are developing, and retain positivity during this period. Skin infections or other ailments are a possibility.
Eating junk food might cause stomach disorders. A minor backache and slight vision disorders are also a possibility. Salaried employees are advised to retain humility at work. They should be gentle with their speech, especially with their superiors. A soft and gentle speech will help retain the amicable atmosphere at work. Family businesses or partnership ventures could be profitable.
Salaried employees are seen putting their maximum effort during this period. Fund flow that has been stuck since long will somehow be released. Marketing personnel will be benefited financially with their smooth and gentle speech. This week there are projections that both your enemies and diseases will be destroyed.
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There will be obstructions in your fate. This is not a good time for people having extramarital affairs. You should take care of your relationships and make sure not to face the bitter side. On the health front, heart patients are advised to be very careful this week. Career-wise, it will be a productive week. There are chances of an increase in the workload by the end of the week. This is a good time for employees.
You will get good support from your supervisors, and any past difference in opinions will be solved. You will be satisfied with your work. You will also be able to move ahead in business courageously. You are likely to become financially independent. You also stand to gain a sum of money from your maternal side of the family. The beginning of the week will be moderate in terms of finances. During the week, your love and private life will see ups and downs. The start and the midweek might not be great in terms of relationships.
However, the end of the week will see an abundance of emotions flowing your way. On the family front, this week will be great. A longstanding family dispute will come to an end and happiness will prevail. Your marriage may see a few ups and downs though. The beginning of the week will work in your favour on the whole.
You are advised to steer clear of losing your temper. Maintaining peace in the family is of utmost importance. Ganesha advises you to stay calm and wait for tiring times to pass. There are chances of some differences cropping up between lovers on the first day of this week. However, a heart to heart conversation will clear the misunderstandings, and the two of you will go back to being your loving selves. During the last three days, you may not be able to give quality time to your partner; thus it would be best if you could tackle the situation with care.
On the health front, you are likely to suffer from eye and throat infections. Chances of you suffering from liver ailments are also high this week. Employees may find the 4th, 6th, 7th and the 9th of this week in their favour. For people in business, the 3rd and the 4th of this week may prove favourable. You may get successive results in matters related to the property during the first half of this week. Whereas, the 6th and the 8th of this week may prove negative for issues pertaining to real estate.
This week may prove great for you on the whole. For your financial matters, you may witness a golden period this week.