What is a crucial piece of evidence that an ancient greek astronomer could have used to support the geocentric model of the solar system?

an ion is a charged atom or molecule. it is charged because the number of electrons do not equal the number of protons in the atom or molecule. an atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.

the answer would be 32*f