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.
Choose Your Zodiac Sign
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.
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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:.
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 ".
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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. You are especially able to attract others--and material things as well--this year. This is a good year for establishing harmony in the family and the home. Advice - develop existing relationships, be positive and receptive because these kinds of energies help you to attract what you desire.
Ruled by Neptune. This is a year of preparation, chance, and refinement. It is not a time of dramatic changes. Instead, it's a year when reflection on the past is helpful, and when refinements to your life path should be made. It's a good year to study, observe, research, and analyze.
Unexpected twists to your life story and "chance" meetings are probable. Advice - take stock of your life in order to prepare for more exciting years to come, examine the past and plan for the future, get in touch with your deepest needs and uncover your personal power, don't strain yourself or actively try to expand. 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. Future Forecast Report. 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. They are attracted to active and unpredictable person who can keep them guessing but also keep up with their energy. For the sociable Aquarius, love comes fast and goes even faster.
You can conquer the heart of Aquarius if you have an interesting personality and you know how to reveal it step by step and you are able to accept their eccentricities. They are prudent and circumspect lovers and although not passionate their gentleness and honesty compensate. Their relationships are likely to grow on friendships as they need time to know the person that stays beside them. They offer everything they have to their loved one and ask for the same. They are most compatible with those born on the 2nd, 5th, 9th, 11th, 14th, 18th, 20th, 23rd, 27th and 29th.
January 20 Zodiac people are most attached to the other two air signs: Gemini and Libra as they tend to share the same vision of life. In love, Aquarius is in a constant search for someone who can understand their inquisitive and adventurous nature and the best to offer them this is actually another Aquarius.
The least compatible with people born on January 20 are those born under Scorpio. As for the rest of compatibilities between the other star signs and Aquarius, you know what they say, stars predispose but people dispose. Blue-green symbolizes loneliness, activity, security and maturity.
The zodiac color should be used in items of clothing or objects in the house.
What Your Sign's January Horoscope Predictions Mean for You
People having blue-green as sign color have a practical and hard working spirit that usually gets them the stable life they aim for. This watery color brings this native a great flow of energy and imagination. The birthstone considered to be representative for Aquarians with January 20 is the seductive Amethyst. Amethyst presents a precious stone that reflects refinery and wisdom. This zodiac birthstone is advised to be used in pendants and earrings.
This is said to help the wearer learn how to express their feelings and ideas in a more eloquent and sincere way. This stone can be found in Brazil and comes in all kinds of purples and mauves. Another precious stone considered beneficial for Aquarius natives is Amber. It represents courage. Orchid is a plant that symbolizes sensibility and refinery. This zodiac flower could be used in gifts and accessories. In ancient Greek, this flower was thought to determine the gender of an unborn child.
This flower is to be found during midspring. Platinum is the metal of preference for Aquarius natives, especially those born under the January Platinum is one of those metals that denote inner strength, power and wealth. This zodiac metal should be used in all kinds of jewelry items that are to be worn frequently. This is one of the rarest metals on Earth and so it associated with an exclusive and prestigious status.
Being resistant to tarnish and wear platinum is frequently used in electronic equipments.
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In regard to the personality of those born on January 20, communication and permanent interaction with other people represents an important aspect and a highlight in their lives. When it comes to love and family, loyalty stands above many other things so they tend to be more permissive then others as longs as devotion stands up. In regard to their behavior with money, they are unusual in their endeavors and hard to follow but often find success in places other people don't even think of searching.
Health is an interesting side for them as they tend to undergo minor incidents in their lives, incidents that make them be more aware of their own bodies. Which of the four do you consider people belonging to January 20 benefit of most? Answer this poll and see how many people think like you:. This decan is under the supervision of the planet Uranus. Those born in this period are generous and idealistic just like a true Aquarius and original and inquisitive just as Uranus makes them be.