Einstein's first premise in GR is that there is no observable evidence on Earth that proves that it moves. (or had you forgotten that?)
The frequency of shooting stars in the morning or evening shows that the earth moves.
The Coriolis effect shows that the earth moves.
Looking through the Hubble telescope shows that the earth moves.
Einstein knew the earth moved.
Still waiting for your math.................
A technologically morphed whale used his new digital flipper to take this pic of his fifth cousin, twice removed!