Go out at night and point your right arm toward the east, keeping your arm and your
elbow straight as a stick and your wrist bent sharply so you can see your palm...







Find a star in the east. Rest the bottom of your hand on it,
keeping your arm and elbow straight as a stick...







One hour later--if you're still in the exact same spot
and you haven't moved your body or your arm--
this star will be on the top of your hand...







Two hours later--if you still haven't moved body or arm--
this star will be on the top of both of your hands.

Now that you have a feeling for our Earth-spin,
why not measure our Earth-spin?

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