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- https://phys.libretexts.org/Bookshelves/Conceptual_Physics/Introduction_to_Physics_(Park)/05%3A_Unit_4-_Modern_Physics_-_Quantum_Mechanics_Special_Relativity_and_Nuclear_and_Particle_Physics/13%3A_Special_Relativity/13.03%3A_Simultaneity_and_Time_DilationTwo simultaneous events are not necessarily simultaneous to all observers—simultaneity is not absolute. Time dilation is the phenomenon of time passing slower for an observer who is moving relative to...Two simultaneous events are not necessarily simultaneous to all observers—simultaneity is not absolute. Time dilation is the phenomenon of time passing slower for an observer who is moving relative to another observer. Observers moving at a relative velocity do not measure the same elapsed time for an event. Proper time is measured by an observer at rest relative to the event being observed and implies that relative velocity cannot exceed the speed of light.
- https://phys.libretexts.org/Bookshelves/University_Physics/Radically_Modern_Introductory_Physics_Text_I_(Raymond)/04%3A_Special_Relativity/4.03%3A_Postulates_of_Special_RelativityThere is thus a symmetry between the world line and the line of simultaneity of a moving reference frame — as the reference frame moves faster to the right, these two lines close like the blades of a ...There is thus a symmetry between the world line and the line of simultaneity of a moving reference frame — as the reference frame moves faster to the right, these two lines close like the blades of a pair of scissors on the 45 ∘ line.
- https://phys.libretexts.org/Courses/Muhlenberg_College/MC%3A_Physics_121_-_General_Physics_I/05%3A__Relativity/5.03%3A_Relativity_of_SimultaneityTwo events are defined to be simultaneous if an observer measures them as occurring at the same time (such as by receiving light from the events). Two events at locations a distance apart that are sim...Two events are defined to be simultaneous if an observer measures them as occurring at the same time (such as by receiving light from the events). Two events at locations a distance apart that are simultaneous for an observer at rest in one frame of reference are not necessarily simultaneous for an observer at rest in a different frame of reference.
- https://phys.libretexts.org/Courses/Muhlenberg_College/MC_%3A_Physics_213_-_Modern_Physics/01%3A__Relativity/1.03%3A_Relativity_of_SimultaneityTwo events are defined to be simultaneous if an observer measures them as occurring at the same time (such as by receiving light from the events). Two events at locations a distance apart that are sim...Two events are defined to be simultaneous if an observer measures them as occurring at the same time (such as by receiving light from the events). Two events at locations a distance apart that are simultaneous for an observer at rest in one frame of reference are not necessarily simultaneous for an observer at rest in a different frame of reference.
- https://phys.libretexts.org/Bookshelves/College_Physics/College_Physics_1e_(OpenStax)/28%3A_Special_Relativity/28.02%3A_Simultaneity_and_Time_DilationTwo simultaneous events are not necessarily simultaneous to all observers—simultaneity is not absolute. Time dilation is the phenomenon of time passing slower for an observer who is moving relative to...Two simultaneous events are not necessarily simultaneous to all observers—simultaneity is not absolute. Time dilation is the phenomenon of time passing slower for an observer who is moving relative to another observer. Observers moving at a relative velocity do not measure the same elapsed time for an event. Proper time is measured by an observer at rest relative to the event being observed and implies that relative velocity cannot exceed the speed of light.
- https://phys.libretexts.org/Courses/Grand_Rapids_Community_College/PH246_Calculus_Physics_II_(2025)/14%3A__Relativity/14.03%3A_Relativity_of_SimultaneityTwo events are defined to be simultaneous if an observer measures them as occurring at the same time (such as by receiving light from the events). Two events at locations a distance apart that are sim...Two events are defined to be simultaneous if an observer measures them as occurring at the same time (such as by receiving light from the events). Two events at locations a distance apart that are simultaneous for an observer at rest in one frame of reference are not necessarily simultaneous for an observer at rest in a different frame of reference.
- https://phys.libretexts.org/Bookshelves/University_Physics/University_Physics_(OpenStax)/University_Physics_III_-_Optics_and_Modern_Physics_(OpenStax)/05%3A__Relativity/5.03%3A_Relativity_of_SimultaneityTwo events are defined to be simultaneous if an observer measures them as occurring at the same time (such as by receiving light from the events). Two events at locations a distance apart that are sim...Two events are defined to be simultaneous if an observer measures them as occurring at the same time (such as by receiving light from the events). Two events at locations a distance apart that are simultaneous for an observer at rest in one frame of reference are not necessarily simultaneous for an observer at rest in a different frame of reference.
