In physics, the relativity of simultaneity is the concept that distant simultaneity – whether two spatially separated events occur at the same time – is not absolute, but depends on the observer's reference frame. This possibility was raised by mathematician Henri Poincaré in 1900, and thereafter became a central idea in the special theory of relativity.
I thought I understood relative time but got confused with this scenario. There are three observers, A, B, and C, each with precise atomic clocks to track each other’s time. Initially, A and B are on Earth, so their clocks match. Observer C is outside the solar system, moving slower based on...