Just wondering if this is the same idea as the measurement of the speed of light done a long time ago by observing and timing the orbits of Jupiter's moons.
Just wondering if this is the same idea as the measurement of the speed of light done a long time ago by observing and timing the orbits of Jupiter's moons.Offhand, it sounds like a rather complex calculation to me, involving the expected displacement of light coming from the quasar at various moments in time during which the gravitational effect should be observable, and given the known information about Jupiter's gravitational force, the speed of light, etc.