Is there an opposite phenomenon for time dilation ?

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SUMMARY

The discussion confirms that there is no opposite phenomenon to time dilation in special relativity, as the effect is symmetric; if one observer perceives another's clock to run slow, the reverse is also true. In general relativity, clock rates are influenced by gravitational potential, with clocks at higher altitudes running faster than those at lower altitudes. Additionally, in accelerating frames, clocks aligned with the direction of acceleration run faster than the observer's own clock. These principles are foundational in understanding relativistic effects on time.

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Can there be a phenomenon that has the opposite effect as that of time dilation ?
 
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In special relativity, no. The effect is symmetric. If I see your clocks running slow then you'll also see mine running slow.

In general relativity clock rate also depends on gravitational potential, so clocks that are above you run faster while clocks below you run slower. The limit to that is intergalactic space, more or less, where there's nowhere further up to go.
 
Also, in accelerating frames clocks in the direction of your acceleration will run fast compared to your own.
 
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