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How old exactly are the pyramids ?

Monday, April 30, 2012 21:23

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The ancient Egyptians used two bright stars in the Big Dipper and Little Dipper constellations to align their pyramids in a north-south direction, a British Egyptologist says. If she’s right, we can now pin down the ages of the pyramids far more accurately than before.

It’s an “ingenious solution to a long-standing mystery”, says astronomer and science historian Owen Gingerich of the Harvard-Smithsonian Center for Astrophysics in Cambridge, Massachusetts. “It seems quite convincing to me. This could pin down the dates of the Old Kingdom of Egypt – the oldest fixed dates in history.”

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The Egyptian pyramids at Giza were built during the third millennium BC as tombs for kings. Their relative ages are known from patchy records of the lengths of the kings’ reigns. But previous estimates of their actual ages have been accurate only to the nearest century.

The tombs are aligned north-south with an accuracy of up to 0.05 degrees. How the Egyptians did this has been unclear. Today, you could align a building north-south by pointing the sides towards the pole star, which sits roughly at true north. However, a wobble in the Earth’s axis of rotation (called precession), means that the positions of the stars changes gradually over time.

In the third millennium BC, no star sat at the north pole. Instead, all the stars in the north sky rotated around an imaginary point marking the north pole.

Experts thought the ancient Egyptians might have watched a single star circle this imaginary point and aligned their pyramid with the circle’s centre.

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