Who first thought that the sun orbited the earth?

I, of course, know that the Sun is indeed orbited by the Earth, and not vice versa, but people used to think that the Sun orbited the Earth.

Anyway, the choices are:

1. Ptolemy

2. Galileo

3. Copernicus

Please help

~Kweenie~

The period of a pendulum varies directly as the square root of the length of the pendulum and inversely as the square root of the acceleration due to gravity. find the period when the length is 144 cm and the acceleration due to gravity is 980 cm per second squared, if the period is 7pi seconds when the length is 289 cm and the acceleration due to gravity is 980 cm per second squared.