Eratosthenes Festivity 2010
21 June 2010 - 21 June 2010

Eratosthenes Festivity is an annual event organized by the Planetarium Science Center (PSC) on 21 June every year since 2003; the day of Summer Solstice in Alexandria and Aswan. Eratosthenes, the Greek scientist and the third librarian of the Ancient Library of Alexandria, was the first scientist who measure the circumference of the Erath before 2000 years ago in these two cities.

This year, the day began with a lecture, telling Eratosthenes' history and explaining how to measure the circumference of the earth. After that, the kinds went to the BA Plaza to do their measurements, followed by a videoconference between Alexandria, Aswan and other countries to compare measurement results.

To view more of the day's activities, please watch


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