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.
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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:.
Horoscope Compatibility Meter
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.
Daily Horoscope for Your Zodiac Sign
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. 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 English name: The Maiden or Virgin. Sun sign dates: August 23 — September Virgo Dates. English name: The Scales.
Aquarius Dates of Birth
Sun sign dates: September 23 — October Libra Dates. English name: The Scorpion. Sun sign dates: October 23 — November Scorpio Dates. English name: The Archer.
Sun sign dates: November 22 — December Sagittarius Dates. English name: The Goat or Sea-Goat. Sun sign dates: December 22 — January Capricorn Dates. English name: The Water-Bearer. Sun sign dates: January 20 — February Aquarius Dates. English name: The Fish. Sun sign dates: February 19 — March Pisces Dates. Toggle navigation. Are you Aquarius? What are the Aquarius dates of birth? Read these sections to learn which days in each month will be good overall, good for money, and good for love.
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Mark them on your calendar — these will be your best days. Similarly, make a note of the days that will be most stressful for you.
December 21 Zodiac - Complete Birthday Horoscope & Personality Profile
It is best to avoid booking important meetings or taking major decisions on these days, as well as on those days when important planets in your horoscope are retrograde moving backwards through the zodiac. The Major Trends section for your sign lists those days when your vitality is strong or weak, or when relationships with your co-workers or loved ones may need a bit more effort on your part.
You will know when to be more tolerant of them and when they are liable to be difficult or irritable. In this edition we have included foot reflexology charts as part of the health section. So many health problems could perhaps be avoided or alleviated if we understood which organs were most vulnerable and what we could do to protect them. Though there are many natural and drug-free ways to strengthen vulnerable organs, these charts show a valid way to proceed.
The vulnerable organs for the year ahead are clearly marked in the charts. Try to pay special attention to the specific areas marked in the charts.