Under this project, SPACE (Science Popularization Association of Communicators and Educators) will help volunteers take actual measurements of the Qutub Minar's shadows made by the sun to measure the circumference of earth.

Autumn equinox is when the night and day are of same length and the sun crosses over the earth's equator, marking the beginning of autumn.

SPACE has been conducting this project previously at various historical sites like Jantar Mantar and using the giant sundial constructed at Barapullah during the Commonwealth Games.

"With the help of this project, SPACE has highlighted that such Indian monuments can be used as tools to demonstrate and get the common man interested in science. It is a showcase for proving that science can be best learnt by doing," said SPACE president CB Devgun.

"In this experiment, students have been able to calculate the circumference of earth to an accuracy of 99 percent," he added.


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