4 ms·
One of my favourite episodes of Cosmos centres around Eratosthenes’ calculation of the circumference of the Earth: https://youtu.be/G8cbIWMv0rI?si=CuX49ki1GIvBL
by ubutler 3y ago
One of my favourite episodes of Cosmos centres around Eratosthenes’ calculation of the circumference of the Earth: https://youtu.be/G8cbIWMv0rI?si=CuX49ki1GIvBLpeL https://youtu.be/G8cbIWMv0rI?si=CuX49ki1GIvBLpeL
- drexlspivey 3y agoHow did they take measurements in two different cities at the same time without clocks?
- wmanley 3y agoIIRC they walked directly north and measured at midday.