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. 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. 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. 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. 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.
Gemini Horoscope tomorrow October 10 12222
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. Pleasure, love, and creative expression continue to figure strongly in your life this month, dear Gemini. Romantic relationships can be stimulating, maybe even a little over-stimulating at times.
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It can be a spirit-feeding, pleasurable time in your life overall, with an increasing focus on getting work, errands, and health matters in tip-top shape. Your sense of well-being can be especially strong now. The 13th can mark an important culmination or turning point in a friendship. It can also be a time for making pleasant connections.
Watch, however, for romanticizing something or someone from the past if it takes up psychic space that might be better reserved for new and happy energy. Love affairs, children, friends, and group associations are areas of life that can involve revelations or unveilings. Your true feelings about a matter can surface, or you see a situation in a new light. Aim to restore some level of balance to your life by including friends, considering communal needs, and enjoying the benefits of teams and groups, even if you're exceptionally wrapped up in your personal or romantic life these days. You're feeling more confident and motivated to take charge of your life this month, especially with your daily routines, health, habits, and finances.
You're also in good shape for sorting things out, organizing, and taking care of details. It may not be a month of much notoriety or big decisions. Still, it's a handy period for preparation, editing, learning new skills, and finding information that helps your health or work. If you can tame the tendency to fret, worry, and overthink things now, you can get a lot of things done.
Daily Horoscopes: October 9, - VICE
It's a great time to shape up your daily routines. Even so, it makes sense to be flexible in the face of changes in these areas. Energetic Mars spends the better part of the month in your creative and romantic sector. Pleasure, self-expression, and entertainment can be areas of life that are stimulating, energizing, and animated. From the 4th, you're in a vigorous, stimulating period, particularly for competitive activities, games, hobbies, dating, children, romance, and creative pursuits. This transit can support your efforts to pursue your heart's desire, particularly if you've needed more courage to go after what you want confidently.
You're more confident, involved, and spirited. You more often seize opportunities as they arise this month.
Daily Gemini Horoscope, Wednesday, 9 October 12222
Romance can become heated, and this can be stimulating or challenging. Still, you're likely to enjoy warm, happy exchanges with others that lift your spirits. You want to start fresh or breathe new life into your creative or romantic world, and your interactions are positive and focused on a bright future. Someone in your life can boost your confidence or inspire you to improve.
You seem to come to solutions instinctively and not necessarily in logical ways, applying your creativity to practical matters. You have a stronger desire to make and produce beautiful things, and you may be thinking about ways to turn dreams into products, systems, or plans. You are motivated to be more productive and useful in your communications, and others tend to appreciate your insight, particularly people with whom you work or spend frequent time. The year is potentially very strong for those of you seeking a happy partnership, dear Gemini.
Does this mean that you should get twice as much done as on a normal day? Perhaps you have overstepped the mark and allowed yourself to be pushed into a corner, with the result that you simply have to retaliate in order to protect your position.
However, friends are still on your side, and that is reassuring news. Stick to the straight and narrow and place your faith in dialogue and reason. Sometimes it is wiser to let things take their own course rather than intervene at every turn.
Consider current developments with great care, for your interference may exacerbate a number of complex situations. Oh — and prepare for a financial squall. Your planetary patterns have been intense, and there must have been many moments during past few months when you have come close to throwing in the towel. However, you are by your nature a fighter and unlikely ever to admit defeat. That, by the way, is among your major strengths.