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this post was submitted on 09 Oct 2025
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You can actually use this, or more generally the shadow of a tree on any sunny day to calculate the distance to the sun !
(Can't seem to find the video demonstrating it, but I have a feeling it's from Physics Girl or Up And Atom on youtube)
The ratio of the size of the image to the distance from the pinhole is the same as the ratio of the size of the sun to the distance to the sun.
Only if you know the sun's size, which kind of presupposes you know its distance.
Strictly speaking, it's not required, but I get your point.
In any case, you can evaluate the relative sizes, which is cool enough ! (⚠️ nerd alert ⚠️)
how?
My gut says Thales' thorem, but this needs checking.
That's why I was looking for the video
shadow length = object height / tan(sun elevation angle)
Some basic trig