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- https://phys.libretexts.org/Courses/Muhlenberg_College/MC_%3A_Physics_213_-_Modern_Physics/01%3A__Relativity/1.04%3A_Time_DilationTime dilation is the lengthening of the time interval between two events when seen in a moving inertial frame rather than the rest frame of the events (in which the events occur at the same location)....Time dilation is the lengthening of the time interval between two events when seen in a moving inertial frame rather than the rest frame of the events (in which the events occur at the same location). Observers moving at a relative velocity v do not measure the same elapsed time between two events. Proper time Δτ is the time measured in the reference frame where the start and end of the time interval occur at the same location.
- https://phys.libretexts.org/Courses/Grand_Rapids_Community_College/PH246_Calculus_Physics_II_(2025)/14%3A__Relativity/14.04%3A_Time_DilationTime dilation is the lengthening of the time interval between two events when seen in a moving inertial frame rather than the rest frame of the events (in which the events occur at the same location)....Time dilation is the lengthening of the time interval between two events when seen in a moving inertial frame rather than the rest frame of the events (in which the events occur at the same location). Observers moving at a relative velocity v do not measure the same elapsed time between two events. Proper time Δτ is the time measured in the reference frame where the start and end of the time interval occur at the same location.
- https://phys.libretexts.org/Courses/Muhlenberg_College/MC%3A_Physics_121_-_General_Physics_I/05%3A__Relativity/5.04%3A_Time_DilationTime dilation is the lengthening of the time interval between two events when seen in a moving inertial frame rather than the rest frame of the events (in which the events occur at the same location)....Time dilation is the lengthening of the time interval between two events when seen in a moving inertial frame rather than the rest frame of the events (in which the events occur at the same location). Observers moving at a relative velocity v do not measure the same elapsed time between two events. Proper time Δτ is the time measured in the reference frame where the start and end of the time interval occur at the same location.
