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Only in the northern hemisphere.

An astrophotographer, and many other people, would know on which hemisphere they currently are, though.

2/6/26, 11:24 pm0 reposts111 likes

But in the tropics it would depend on the date.

Isn't that also something that most astrophotographers would know?

You'd have to ask them, but I might not know when "No Shadows Day" is at a particular latitude is without an ephemeris.

Or an Eratosthenes.

Very true.