Reply To: Module 2 – The Moon, the Earth and the Sun

[Frances McCarthy]

Rhonda,

another historical figure to mention is Eratosthenes, who calculated the size of the Earth from shadows. He knew the Earth was round.

The Eratosthenes experiment: calculating the Earth’s circumference

has an activity for second level students – if you do the maths, you could have your class do the measurements.

and this site has the great Carl Sagan explaining what Eratosthenes did.

https://surroundedby.science/2023/03/15/discovering-the-size-of-the-earth-the-eratosthenes-experiment/