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Updated: June 7, 2025
On the contrary, seen from this viewpoint, Roemer's discovery of the light's travelling with finite speed within the cosmic realm marked by the earth's orbit provides an important insight into the dynamic conditions of this realm.
In a certain sense Roemer's observations and even those of Bradley rank together with the terrestrial measurements. For Roemer used as optical signals the appearance and disappearance of one of Jupiter's moons in the course of its revolution round the planet; thus he worked with light-flashes, as the experimental investigations do.
Thus the speed of light which has been measured by observers such as Fizeau and Foucault reveals itself as a function of the gravitational constant of the earth, and hence has validity for this sphere only.1 The same is true for Roemer's and Bradley's observations, none of which, after what we have stated earlier, contradicts this result.
The former category is represented by Roemer's observations of certain apparent irregularities in the times of revolution of one of Jupiter's moons , and by Bradley's investigation into the reason for the apparent rhythmic changes of the positions of the fixed stars .
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