In the equator, when the sun forms a right angle with the earth, the tree and its shadow.


eratosthenes wants to know how many stadia south of alexandria this is

I did some digging on this, and while it’s not that it *doesn’t* happen on the equator, it’s more complicated than that:


(photo by cmglee, STyx et al)

See also: https://en.wikipedia.org/wiki/Lahaina_Noon


#geography #sun #shadows #neat #the more you know #reply via reblog

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