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.
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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 10 November 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.
Zodiac Signs: Know All About Your Sun Signs
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.
February 8th Zodiac
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.
Horoscope WRONG? Why Your Zodiac Sign May Have Changed …
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". Ruled by Uranus. This is a year of work and development.
February 8 Zodiac - Complete Birthday Horoscope & Personality Profile
It's "nose to the grindstone" time. It's a time to pay special attention to practical matters, and it's not a time to be lazy or especially gregarious. Positive new relationships are often not formed in a Four personal year. However, it can be a wonderful year for building, development, and laying a solid foundation for future successes.
Advice - get yourself organized, work to build your resources, keep busy. Ruled by Mercury. This is a year of discovery and freedom. It's a time when exploration and reaching out to others brings opportunities. It's a good time to advertise, promote, and sell. Surprises are in store, and the routine is broken for the better.
This is a year when exciting relationships can be formed; or, if you are already in a partnership, new life is breathed into the relationship. Advice - explore, look for adventure, keep your eyes open for opportunities, diversify, mingle. These lengthy, detailed, and comprehensive reports reveal the themes and circumstances you are likely to encounter in the coming year and are based on your actual birthday, time, and place, as well as your current place of residence.
This report also makes a great birthday present—for yourself or others.
See a sample of one of these reports here , and find out more information about this personalized birthday forecast here. Please note: we only recommend this report if you know your birth time. We also offer other forecasting reports. Get your Forecast report here. Back to If Today is Your Birthday.
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All About Aquarius Aquarius Ascendant. These interpretations are partially based on the Solar Return chart in astrology. Of course, the Solar Return chart is most accurate, personalized, and descriptive, when the birth time and place in addition to the birth date are known. These forecasts also incorporate Numerology and Personal Year Numbers. On the other hand, the ever-alluring world of entertainment could take you to a career in television or film, which was the path of Seth Green, who was also born on February 8th.
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If you are musically inclined, your creativity may be well-suited for a career as a composer or lyricist, much like John Williams, another of your celebrity birthday twins.