(Tom shared this activity with me, and I've used it successfully several times.)
On the first day of class, when I'm introducing basic sky-watching concepts, I ask my students to point North. As you might expect. I get the usual mix of fingers pointed to different horizons, but I also get about 25% pointing straight up.
These students think the zenith is North. It's an understandable misconception. When we were younger, many of us learned to read maps with "north" being "up" on the map. So north must be up, correct?
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