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If person A sees person B, person B will appear small to them; at the same time, person A will appear small to person B.

That is to say, in a frame moving relative to the local clock, this clock will appear to be running more slowly.As a result of the nature of spacetime, a clock that is moving relative to an observer will be measured to tick slower than a clock that is at rest in the observer's own frame of reference.A clock that is under the influence of a stronger gravitational field than an observer's will also be measured to tick slower than the observer's own clock.It was found that Left: Observer at rest measures time 2L/c between co-local events of light signal generation at A and arrival at A.Right: Events according to an observer moving to the left of the setup: bottom mirror A when signal is generated at time t'=0, top mirror B when signal gets reflected at time t'=D/c, bottom mirror A when signal returns at time t'=2D/c This constancy of the speed of light means that, counter to intuition, speeds of material objects and light are not additive.

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