I'm reading an introductory book on astronomy called _Discovering
Astronomy_ by William H. Jeffrys and R. Robert Robbins. On page 7 is
a description of the pendulum experiment by Foucault in 1851 designed
to prove that the earth rotates on its axis. Theoretically, the
pendulum should rotate opposite to the Earth's rotation. Question 9
asks: "Why doesn't the plane of oscillation of the pendulum rotate at
the equator?" I don't know the answer. Can anyone tell me why?

Thanks.

--

Cindy Smith Unless the LORD build the house,
they labor in vain who build.
Unless the LORD guard the city,
in vain does the guard keep watch.
Me transmitte sursum, -- Psalm 127:1
Caledoni! All your base are belong to us.
A Real Live Catholic You are on the way to destruction.
in Georgia! What you say.
- - Go against the flow! You have no chance to survive make your time.