Bern Switzerland, June 30, 1905

Einstein's eighth paper, On the Electrodynamics of

Moving Bodies, Annalen der Physik 17: pg. 801-921.

This landmark in the development of physics (Special Theory of Relativity), is one of two papers that laid out the structure of the theory of relativity, the other "The General Theory", formulated a new conception of time, by assuming that the speed of light is the same to every observer moving at a constant velocity. Einstein showed that that space and time were not independent: Thus spacetime was born.

According to Herman Weyl in 1918, this theory "led to the discovery that time is associated as a fourth coordinate on an equal footing with the other three coordinates of space, and that the scene of material events, the world, is therefore a four-dimensional, metrical continuum." It was a revolutionary piece of scientific work.

Einstein's exploration of the nature of simultaniety and expression of the necessity of defining simultaniety was also explored in this landmark paper.