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I am reading a book about relativity and early on in the book I read the following:

"...By means of similar considerations based on observations of double stars, the Dutch

astronomer De Sitter was also able to show that the velocity of propagation of light

cannot depend on the velocity of motion of the body emitting the light..."

The author does not go into any detail about this experiment. My question is, could someone pleaseeitherexplain:

1) The experiment mentioned in the quotation above with some detail.

2) Or, explain the idea above using a different experiment (assuming one was made) which leads us to the same conclusion.

Thank you for your help.

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# Proof: Velocity of Light can't depend on velocity of body emitting the light

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