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You are a stick that can walk.
When your shadow is as long as you are, the sun has told you something.
Stand in the sand. You throw a shadow, same as any stick. Morning: the shadow is a giant. Noon: it crawls back toward your feet. There is a moment — you can wait for it — when the shadow is exactly as long as you are tall. At that moment the sunlight is leaning 45°, halfway from the horizon to straight up. You just measured the sky with your body.
Drag the sun. When the two lengths match, the picture will say so.