- Precession is caused by gravitational forces from the moon and the sun on a bulge in the Earth at the equator. These forces cause the orientation of the Earth’s axis of rotation — what we think of as the poles — to wobble like a spinning top losing momentum. This wobble traces a cone in a cycle that lasts about 26,000 years. During this cycle, the traditional North Star eventually becomes invalid and the Zodiac signs shift.
- Precession of the equinoxes occurs at a rate of roughly 5 arc minutes of a degree every 6 years.
- The zodiac (Greek: ζῳδιακός, zōdiakos) is the ring of constellations that lines the ecliptic, which is the apparent path of the Sun across the celestial sphere over the course of the year.
- The term zodiac means "circle of animals" because half the signs are denoted by animals, apart from two of them.
- The division of the ecliptic into the zodiacal signs originates in Babylonian astronomy.
- Gemini and Cancer can be traced back to the Bronze Age
- Horoscopic astrology first appeared in Ptolemaic Egypt.
- It is important to distinguish the zodiacal signs 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 by nature of their varying shapes and forms take up varying widths of the ecliptic. Thus, Virgo takes up fully five times as much ecliptic longitude as Scorpius
- The zodiacal signs, on the other hand, are an abstraction from the physical constellations designed to represent exactly one twelfth of the full circle each, or the longitude traversed by the Sun in about 30.4 days.
- Taking the current constellation boundaries as defined in 1930 by the International Astronomical Union, the ecliptic itself passes through an additional thirteenth constellation, Ophiuchus, situated between Scorpius and Sagittarius.
- No studies have shown any scientific support for the accuracy of horoscopes, and the methods used to make interpretations are, at best, pseudo-scientific.
- The Zodiac is centered on the ecliptic,occurs at the exact moment that the Sun crosses the celestial equator and enters the zodiac sign of Aries.
Friday, January 14, 2011
In honor of all the stupid on facebook
If anyone took astronomy when they were in high school, or college for that matter, they would know that the earth wobbles ever so slightly on its axis a phenomenon called “precession" that has moved us one month to the west in the sky and so thousands of years later (like today) the sun will shine through a different constallation on our birthday than what it used to. Oh, I was assuming you knew that...Your zodiac sign is supposed to be the sign the sun is in when its you were born. So if you were a leo you are staying a leo. The new calendar wouldn't apply to you. Okay, this might be sounding like a pile of words now so here you go:
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