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The National Institute for Astronomical and Geophysical Research, in collaboration with the Public Library of Egypt in Aswan, will replicate the historic method of measuring the Earth's circumference using Eratosthenes' technique. This will take place during a simulation of the sun's declination on the Tropic of Cancer in Aswan and Alexandria. The event aims to raise awareness among children and young people about the scientific principles that the ancient Alexandrian scientist relied upon. It will involve measuring shadows and calculating angles, along with a lecture and the manual repetition of the experiment. The activity is scheduled for June 21, 2026, at noon on that day, coinciding with the summer solstice.
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