Link: Wikipedia; Michelson

The Michelson Gale-Experiment shows that due to the Sagnac effect the rotation of earth can be determined by a ring interferometer.


The angular velocity of earth rotation could be determined within measurement accuracy.

Test Question 5:

What is the conclusion of the result of the Michelson-Gale experiment?

Choice of test answers:

A) The speed of light relative to a resting source on earth surface  differs between the direction to west and direction to east by the rotation speed of earth surface.

B) On earth surface the propagation speed of light in vacuum (dark matter) is constant to all directions.

C) The result of the Michelson-Gale-Experiment is conform to a gravitational dragged ether (dark matter).

D) The anisotropy of light speed on earth surface is determined  by the rotation speed  of earth.