Ritz, binary stars, moving source, Algol, de Sitter
Proceddings of the V International Congress of Philosophy - Naples May 5-7, 1924
Thomas Miles used Google Translate for English
The first affirms the impossibility of revealing and measuring by means of any "physical fact" the absolute motion of bodies, or more precisely, the motion of matter with respect to the ether.
It was first stated clearly by Einstein, the which he had and has the great merit of having had this profound intuition need for facts, through the numerous negative experiences, made with purpose of discovering and measuring the motion of the Earth, with respect to the ether.