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  2. Time dilation - Wikipedia

    en.wikipedia.org/wiki/Time_dilation

    Time dilation is the difference in elapsed time as measured by two clocks, ... Travel to regions of space where extreme gravitational time dilation is taking place, ...

  3. Hafele–Keating experiment - Wikipedia

    en.wikipedia.org/wiki/Hafele–Keating_experiment

    The time difference was measured by direct clock comparison at the ground before and after the flight, as well as during the flight by laser pulses of 0.1 ns duration. Those signals were sent to the plane, reflected, and again received at the ground station. The time difference was observable during the flight, before later analysis.

  4. Spacetime - Wikipedia

    en.wikipedia.org/wiki/Spacetime

    In physics, spacetime, also called the space-time continuum, is a mathematical model that fuses the three dimensions of space and the one dimension of time into a single four-dimensional continuum. Spacetime diagrams are useful in visualizing and understanding relativistic effects, such as how different observers perceive where and when events ...

  5. Gravitational time dilation - Wikipedia

    en.wikipedia.org/wiki/Gravitational_time_dilation

    Gravitational time dilation is a form of time dilation, an actual difference of elapsed time between two events, as measured by observers situated at varying distances from a gravitating mass. The lower the gravitational potential (the closer the clock is to the source of gravitation), the slower time passes, speeding up as the gravitational ...

  6. Twin paradox - Wikipedia

    en.wikipedia.org/wiki/Twin_paradox

    9 Difference in elapsed time as a result of differences in twins' spacetime paths. 10 Difference in elapsed times: ... The x–t (space–time) diagrams at right show ...

  7. Timekeeping on Mars - Wikipedia

    en.wikipedia.org/wiki/Timekeeping_on_Mars

    The actual landing site was about 0.02° (1.3 km) east of that, a difference of about 5 seconds in solar time. The local mean solar time is also affected by the rover motion; at 4.6°S, this is about 1 second of time difference for every 246 meters of displacement along the east–west direction.

  8. Absolute space and time - Wikipedia

    en.wikipedia.org/wiki/Absolute_space_and_time

    Time is a scalar which is the same in all space E 3 and is denoted as t. The ordered set { t } is called a time axis. Motion (also path or trajectory ) is a function r : Δ → R 3 that maps a point in the interval Δ from the time axis to a position (radius vector) in R 3 .

  9. Shapiro time delay - Wikipedia

    en.wikipedia.org/wiki/Shapiro_time_delay

    The measured elapsed time of a light signal in a gravitational field is longer than it would be without the field, and for moderate-strength nearly static fields the difference is directly proportional to the classical gravitational potential, precisely as given by standard gravitational time dilation formulas.