Reply to post: Transit of Venus 1639.

Astroboffins capture video of Mercury passing across the Sun's surface

Symon Silver badge
Boffin

Transit of Venus 1639.

This was how astronomers Jeremiah Horrocks and his friend William Crabtree measured the size of the solar system.

https://en.wikipedia.org/wiki/1639_transit_of_Venus

Very clever indeed!

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