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There’s this geometric diagram that apparently shows the size of the Earth compared to the Moon. I wanted to see if this was true and it also got me thinking… How did they know how big the Moon was back in the day before all the crazy good technology we have nowadays. I did some digging and the method they used was pretty ingenious.

Radius of first circle: 4.2cm

References:
Sun, Moon & Earth book: https://amzn.to/3V2Eb2n
How to measure the Earth: https://en.m.wikipedia.org/wiki/Eratosthenes
How to measure the Moon: http://galileoandeinstein.physics.virginia.edu/lectures/gkastr1.html

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