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February 21, 2020 05:20 pm

Why the Earth's Wobble Means Your Zodiac Sign Isn't What You Think

As the planet spins on its axis, it teeters back and forth like a child's top, and after millennia of staggering along its path around the sun, it no longer aligns with the constellations of the zodiac on the dates that were established in ancient times. From a report: Because of that, Leo ain't what he used to be -- and neither are Aries, Taurus, Gemini or any of the rest. In astronomical terms, the wobble is known as precession, and it's caused by gravity tugging on the Earth's distended midriff. "The Earth bulges at the equator, and the gravitational pull of the sun and Moon together act on that bulge," said James B. Kaler, professor emeritus of astronomy at the University of Illinois at Urbana-Champaign. Over a period of roughly 26,000 years, the planet's wobble traces a full circle, gradually making the stars appear to shift to the east by about one degree over the span of a human life. "It sounds slow," Dr. Kaler said, "but it changes the polestar." The polestar appears directly above the North Pole and marks due north. Today, Polaris, which is sometimes called the North Star, is located at the tip of the Little Dipper's handle and is the Earth's polestar. A few thousand years from now, Vega, the brightest star in the constellation Lyra, will occupy that position. The creeping discrepancy in the alignment of the Earth, sun and constellations was first noticed by the Greek astronomer Hipparchus, who lived from 190 B.C. to 120 B.C., and is considered the founder of trigonometry.

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