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.
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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.
Zodiac Sign Dates of Birth - Zodiac Sign Astrology
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.
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 The Observatory. Bibcode : Obs He later issued a statement to say he had not reported that the zodiac ought to include 13 signs instead of 12, but was only mentioning that there were 13 constellations; reported in Mad Astronomy : Why did your zodiac sign change?
International Planetarium Society. Retrieved 21 March The date in other time zones may vary. The Unicode Standard. History of the Zodiac. Sophia Academic Press. At the moment, your heart and mind are quietly untroubled. Today you're as peaceful as a dove and helpful as a child, which means you're content to let others run the show. You have no problem taking direction from someone else, as long as their heart is in the right place. You're demonstrating the power of acquiescence now.
This doesn't mean that you've given up control to someone else, though. It's just that passive control can be so much easier. Not to mention more effective! Something's off. Maybe your mood and energy aren't right. You feel entitled to many things, but you don't quite know what they are.
You could be feeling needy or grabby. On the other hand, you might have enough self-control to restrain yourself until you figure out what you're lacking. What matters more is how you fulfill those or soothe those needs. One thing is certain: Good or bad, this will be a brief, surprising period. You could learn a lot about yourself and the way you operate. Be forewarned: The immaculate condition of your life is about to change. The waters are muddied by messy emotions today. As much as you might prefer life to be neat, clean and efficient at all times, you have to accept the fact that you occasionally need other people.
Whatever's going on, consider this a warm welcome back into human society. This is what being alive is all about, so enjoy it. Be glad there's affection in your life. That's far more than some can say. You've been trying your hardest. You've been wearing the biggest smile you've got and speaking in your sweetest voice. And yet, you just can't seem to win them over. All this toxic niceness is backfiring. It's time to do something decisive to save the situation, or at least yourself. Today, figure out a way to shake them awake by other means.
And don't neglect the benefits of stating your case or your opinion plainly. You tend to avoid being direct with people, but sometimes it's the only way to get through to them. You've been keeping to yourself, haven't you? When the phone rings, you let your voicemail answer. When a friend sends an e-mail, you file it away for later response. And that's okay. Seclusion suits you well right now. Your focus and energy have turned inward.
You're taking sublime inventory of your true, inner self. It's best to keep your own counsel today. That way, you can tighten your focus and establish a solid plan for the moment you'll spring into action. And when that happens, well -- watch out, world! You seem careless and quirky, fashionably sloppy yet daring to be different. It's all an act, obviously a very good one, but an act just the same. Deep down, you're seething with conventional anxieties. Welcome to the human race.
Of course, you don't have to dwell on this stuff all the time. Just be yourself today as kind of a check-in. Let real friends offer real help. They actually like you even if you're all living with one foot in the land of illusion. And that's one less reason to complain. Respect what others call holy or authentic, even if your inner voice tells you they're trying to scam you or just deluding themselves.
But along with giving them your respect, it wouldn't hurt to look beyond or behind what they say. Maybe you'll get a better idea about what they're thinking and what unseen forces are at work here. Keep these investigations within the realm of peaceful curiosity, because you're really not trying to make trouble. You can learn a lot about your world today, and maybe then you'll be better qualified to judge, or even see that judgment is meaningless. Today is a good time to connect with your own watery energy.
Let it flow subtly and beautifully by meditating on the movement and quality of water itself -- that free-flowing thing that meanders wherever it can. That's how your thoughts should work. Don't curtail your imagination or impose any expectations of practicality on yourself, especially if you're developing ideas for a project. Let your mind flow. Take notes on where it leads you. Most of all, don't be lured by loud, shiny novelties.
You don't need them. The best stuff comes unannounced. Be ready to respond to anything. Maybe they're saying it's none of your business, but how can any of you be sure about that? Your words will be liquid today, and your actions will be fluid. Your position will be bendable, too.
Either you do a lot of yoga, or you've got relaxation down to a science. Some people may call you spineless for all this, but that's only because they're so rigid. All you're doing is changing with the changes, and that's OK for now. Though it may work against your mood or your very nature, do your best to be patient and pleasant today.
You aren't alone in this world, and you need people in your corner, whether you're combining efforts at work or with friends. Keep your motives pure. That way, other people will know they can trust you. Does this really cost you so much? Even if today's reality doesn't line up with your favored fantasies, at least you'll know you're not forcing it. They don't have to tell you what good taste is. You're already way too cool and suave for that kind of advice. You can read situations and minds because people's true intentions are evident to you.
Of course, you don't want to creep them out by flaunting your psychic abilities. Your best bet is to observe and then act accordingly. If you can take the social pulse today, you'll be positioned to improve the spiritual health of friends and strangers alike. Get them to smile and trust each other, and that'll be your first step right there. It's OK if your dreams are big. A healthy fantasy life is important, and who can control what their unconscious mind washes up?
But there could be trouble if your hopes are as unrealistic as your dreams. You're flirting with movie stars whose lunch would cost you a week's pay. You're way too loose-lipped with other people's secrets. Common sense sinks beneath a flood of wannabe one-upmanship. This can't be healthy. Watch your back today. You might be having fun, but somebody else could take this way too personally. Images and intuition come quickly now, overflowing your mind. You know your perceptions are accurate, because they're completely from the heart. You're meeting the world on its own terms, which is to say, you've let go of what's logical in favor of what simply is.
Be sure to write these dreams and inspirations on the wall, so everyone can have a few days to ponder your vision. That way, you can all act together. Not now, though. This period is all about letting your thoughts go where they will. You can turn them into something concrete later. You're a bit of a dreamer, especially under today's energy.
You just want life to be incredible. Is that so much to ask? Often it is. At the moment, you need to take stock of yourself.
Taurus Dates of Birth
Consider whether you're working to fix what's broken or just fixating on how you wish things would turn out. Wild, romantic idealism at the moment will only cause you to suffer needlessly. It may seem depressing to be realistic. But you'll be a lot better off if you stick with what's possible.
Who's truly deserving of your charity? Figure this out today, and be judicious. That shouldn't be too difficult, even under the current, idealistic energy. You're analytical by nature, so turn that sharp eye of yours toward the areas of your life in which you give too much. You might find you've been overly compassionate with some people but not enough with others, including yourself. That's right: You're deserving of your own kindness, more than anyone.
At the very least, find ways to trim your selfless giving to what's truly necessary. You've always been a bit gullible. That tendency could get you into trouble today. You're always so anxious to please everyone.
Being the idealist you are, you'll jump too fast at irrational suggestions instead of taking the time to think things through. Weigh out what's a good idea and what isn't. It's obvious to everyone around you that your hopes are high. Make sure you don't invite anyone to take advantage of your eagerness or your good intentions.
Mysteries and intrigue move through your mind like strange fish through deep, dark water. You know what it all means, or at least, you have a pretty good idea -- even if no one else does. And that's just fine. Be as cryptic as you please today. There's no reason to share your thoughts or plans with anyone else, and as long as you're considerate, who can complain?
Eventually you'll explain what it all means, but until then, keep to yourself. That's what makes you so sexy. What's so great about the home team? It's just people playing a game, not some deep part of your identity. While there's a lot to be said for blending in with the landscape, chameleons need to show their true colors from time to time.
The moment for sly criticism is over. Be honest about you who really are, what you really think, and be realistic about the consequences. Go your own way today. Follow a more natural course. It might be closer to what you want. Embrace your imagination in a bear hug. This could be your chance for really getting to know your unconscious mind. While that's sure to make you deeply happy, and while that happiness is sure to make you more open and honest, you probably want to be a little more cautious with others. Not everyone reacts well to bear hugs, you know. It might take a while before you know their hearts and dreams.
Let them offer these things freely, because you're less likely to find out anything about them if you keep trying to penetrate their defenses. You need definite physical boundaries but plenty of mental space for your mind to roam. You're working on something good today, and your ideas shouldn't be constricted by the bonds of reality or other expectations.
If this is a group project you're planning, your friends or work mates might wonder why you have became distant and dreamy. Don't worry about it. You can explain it to them later, or let your ideas speak for themselves. Get some alone time if you can.
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