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The Great Pyramid of Giza was constructed about 4,500 years ago, under the orders of Egyptian pharaoh Khufu. (Photo: Pixabay)

Secret behind perfect alignment of Egypt's Pyramids decoded

For over a century, researchers have proposed different methods used by the ancient Egyptians to align the pyramids.

20 Feb 2018 5:59 PM IST

Stonehenge, a World Heritage site, is believed to be 4,500 years old. It is known for its alignment with the movements of the sun. (Photo: AP)

Thousands watch summer solstice from Stonehenge

Summer solstice: 10,000 watch sunrise at England's famous Stonehenge.

22 Jun 2019 11:44 AM IST

Religious fanatics burnt the library of Alexandria charging that it contained blasphemous and lewd books, and in India, the orthodoxy was mired in the puranic Saptadwipa (in which the Earth was seen as one big island).

Geosphere: Measuring the size of Earth

Greek astronomer and mathematician unravels the mystery of how an ancient Greek astronomer got the size of the Earth...

16 April 2017 6:42 AM IST