@johncarlosbaez@mathstodon.xyz
Post #2293278
2026-02-25 01:51 UTC
@morgaelyn@bolha.us - it's most obvious in winter. Then you'll see the sun moving clockwise as in the picture below. But once you get the idea you can see it at any time of year. And when I was in Australia, it was very evident that the sun was going around the other way! It was kind of freaky.
It's also obvious if you look at a sundial. A northern hemisphere sundial doesn't work in the southern hemisphere!
Replies (2)
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@liuyao@mathstodon.xyz 2026-02-25 01:58
@johncarlosbaez@mathstodon.xyz @morgaelyn@bolha.us Presumably sundials only work at specific lattitude? The Chinese ones can work anywhere, you just have to tilt it differently https://commons.wikimedia.org/wiki/File:Beijing_sundial.jpg
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@magnus@mastodon.world 2026-02-25 04:04
@morgaelyn@bolha.us @johncarlosbaez@mathstodon.xyz Arguably, the sun moves counterclockwise above you in the northern hemisphere. Lie down on the ground with your feet to the south and look up. The sun will rise on your left, move to the feet and then set on your right. Definitely counterclockwise. This is very clear in the summer far north. Shadows move clockwise on the ground, as we there see the rotation from above, looking down. I think.