Trethevy Quoit 11
Image by Meic
Trethevy Quoit

Who's going to be there this weekend?

nigelswift N
nigelswift Apr 23, 2011 02:50:59
Replying to juamei

Now I come to think of it, you need your vertical aperture not to be in Cornwall but the tropics to do the calculation. (In his case it was in Syene, where he knew the sun shone down a well at midday at Solstice). http://www.juliantrubin.com/bigten/eratosthenes.html

So the short answer is no, a vertical aperture in Cornwall wouldn't help. ;) Sorry!

S Sanctuary
Sanctuary Apr 23, 2011 06:00:07
Replying to nigelswift

nigelswift wrote:
Now I come to think of it, you need your vertical aperture not to be in Cornwall but the tropics to do the calculation. (In his case it was in Syene, where he knew the sun shone down a well at midday at Solstice). http://www.juliantrubin.com/bigten/eratosthenes.html

So the short answer is no, a vertical aperture in Cornwall wouldn't help. ;) Sorry!

Jethro will be disappointed! :D

J juamei
juamei Apr 23, 2011 06:26:59
Replying to nigelswift

You also need it to be completely vertical, which would be practically impossible to verify on such a small scale. Very impressive how close he got though.

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