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.
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.
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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.
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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.
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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.
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I consider you — the reader — my personal client. By studying your Solar Horoscope I gain an awareness of what is going on in your life — what you are feeling and striving for and the challenges you face. I then do my best to address these concerns. Consider this book the next best thing to having your own personal astrologer!
It is my sincere hope that Your Personal Horoscope will enhance the quality of your life, make things easier, illuminate the way forward, banish obscurities and make you more aware of your personal connection to the universe. Understood properly and used wisely, astrology is a great guide to knowing yourself, the people around you and the events in your life — but remember that what you do with these insights — the final result — is up to you.
Simply by knowing the date of your birth you can gain insightful and astonishingly accurate luck-making information about yourself—your strengths, weaknesses, health, relationships, destiny, career, and life goals—as well as your friends, family, lovers, colleagues, and even people you have just met.
The power of your birthday is determined not just by your ruling planet but by a number of other invisible influences and patterns in place the day you were born. However you decide to read this guide, never forget that every person is born unique and full of potential. This modality of those born on June 17 proposes courage and wander and also offers a sense of their adorable nature. Ruling house: The third house. This house placement symbolizes communication, knowledge and social interaction. This says a lot about the interests of Geminis and their life perspectives.
Ruling body: Mercury. This connection suggests advantage and philosophy. It also reflects on the humor in the lives of these natives. Mercury has the fastest orbit of any planet, circling the Sun in 88 days. Element: Air. This element suggests the sense of realism and caution in the life of those born on June 17 and determines him or her to be even more aware and engaged.
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Combined with the element earth, air seems to smother or incorporate in it. Lucky day: Wednesday.
Ruled by Mercury this day symbolizes exchange and open mind and seems to have the same conscious flow as the lives of Gemini individuals. People born on June 17 can be defined as conscientious, curious and adventurous. Just like a true Gemini they are captivating, malleable and funny. They enjoy learning new things and having contact with the outside world at all times. They hate feeling lonely and they avoid any kind of ordinary that can be established in their lives.
The best setting for those born under this sign relates to all settings where they can state their beliefs, and they do have beliefs about everything. Positive traits: These people are characterized by eloquence, courage and a artistic brilliance of mind. Gemini people are usually lively and positive.
They turn out to be very charitable with the people they like and very passionate about their loved one if they ever settle for one person. Those born under this sign are also in a never-ending search for new experiences as their agitated imagination never wants to take a break. Negative traits: These natives often give up quicker than they should and are extremely selfish at times. They tend to be quite irritable and accumulate tension in situations where they feel they are not the privileged ones. They also start many projects at once and have a tendency to involve a lot of people in them to then change their mind and leave everyone half way through.
They are manipulative and can loose their temper quickly when people don't respond the way they expect them to. Lovers born on June 17 are versatile and ingenious.