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1. Let S be an x-coordinate system. The origin of S is located at x = 0m. Let S' be an x'-coordinate system. The origin of S' is located at x' = 0m. This information is not sufficient in order to determine where the origin of one system is located with respect to the other.
2. Let system S' move along the x-axis of system S with a constant velocity v in the direction of increasing x.
3. Let observer A (who is able to count the time t like a clock in such a way that each of his count is exactly 1s) be stationed at the origin of S, and let observer B (who is able to count the time t' in all respects like observer A) be stationed at the origin of system S'.
4. Let the origin of the moving system S' be located, with respect to the stationary system S, at x = a at the time tA = t'A = 0s, so that the origin of the stationary system S, with respect to the moving system S', is located at x' = -a at the time tA = t'A = 0s.
5. If a ray of light departs from the origin x = 0m of the stationary system S at the time tA = 0s, and arrives at the origin of the moving system S' at the time t'B, then
t'B = a/(c - v).
6. If the ray of light is reflected at the time t'B back to the origin x = 0m of the stationary system S, arriving there at the time TA, then
TA - t'B = a/(c - v).
7. If the ray of light departs from the origin x' = 0m of the moving system S' at the time t'A = 0s, and arrives at the origin of the stationary system S at the time tB, then
tB = a/c.
8. If the ray of light is reflected at the time tB back to the origin of x' = 0m of the moving system S', arriving there at the time T'A, then
T'A - tB = (a + v*tB)/(c - v).
2. Let system S' move along the x-axis of system S with a constant velocity v in the direction of increasing x.
3. Let observer A (who is able to count the time t like a clock in such a way that each of his count is exactly 1s) be stationed at the origin of S, and let observer B (who is able to count the time t' in all respects like observer A) be stationed at the origin of system S'.
4. Let the origin of the moving system S' be located, with respect to the stationary system S, at x = a at the time tA = t'A = 0s, so that the origin of the stationary system S, with respect to the moving system S', is located at x' = -a at the time tA = t'A = 0s.
5. If a ray of light departs from the origin x = 0m of the stationary system S at the time tA = 0s, and arrives at the origin of the moving system S' at the time t'B, then
t'B = a/(c - v).
6. If the ray of light is reflected at the time t'B back to the origin x = 0m of the stationary system S, arriving there at the time TA, then
TA - t'B = a/(c - v).
7. If the ray of light departs from the origin x' = 0m of the moving system S' at the time t'A = 0s, and arrives at the origin of the stationary system S at the time tB, then
tB = a/c.
8. If the ray of light is reflected at the time tB back to the origin of x' = 0m of the moving system S', arriving there at the time T'A, then
T'A - tB = (a + v*tB)/(c - v).
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