how do we know the earth spins?

Answer 1

Earth is the only planet whose English name does not derive from Greek/Roman mythology. The name derives from Old English and Germanic. There are, of course, hundreds of other names for the planet in other languages. In Roman Mythology, the goddess of the Earth was Tellus - the fertile soil (Greek: Gaia, terra mater - Mother Earth).
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Answer 2

this question has come round again so the earth must spin around

Answer 3

Well its either the earth, or the rest of the universe rotates around us, going by the heavenly bodies we can see. It's unlikely that this planet is the centre of the universe.

Answer 4

Simple gravitational-relativity calculations. Or, if you don't get any of that stuff, we can literally stop you in your tracks, and you will simply disappear from us and never come back for a long, long, long time (until the galaxy returns to where it once was, which doesn't seem to be possible in current theories).

Answer 5

most people say it's cause of night and day, but that's not correct, we might not know the sun could be rotating on us.

the answer is the Foucault Pendulum. There's an explanation here http://www.griffithobs.org/exhibits/Pendulum/pendulum.html

Answer 6

simple.. there's day and night.. we can see the sun shine and set.. there are satellites roaming around the earth.. there are tides occuring in different areas.. etc.. lots of reasons to prove that..

Answer 7

there are days, there are nights... it's spinning!

Answer 8

Galileo proved it with his pendulum

Answer 9

Look at the sky at night...

Answer 10

sattelite station thingys, the ones that take pics