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  2. Epicentral distance - Wikipedia

    en.wikipedia.org/wiki/Epicentral_distance

    The epicentral distance, source depth, and time difference of various recorded waves can be compiled into time distance curves and travel timetables suitable for local use. When an earthquake occurs in a certain place, the analyst can measure the time difference of various waves of the earthquake from the seismogram and calculate the epicentral ...

  3. Comoving and proper distances - Wikipedia

    en.wikipedia.org/wiki/Comoving_and_proper_distances

    Physical cosmology. In standard cosmology, comoving distance and proper distance (or physical distance) are two closely related distance measures used by cosmologists to define distances between objects. Comoving distance factors out the expansion of the universe, giving a distance that does not change in time due to the expansion of space ...

  4. Lunar distance - Wikipedia

    en.wikipedia.org/wiki/Lunar_distance

    Lunar distance (LD or ), or Earth–Moon characteristic distance, is a unit of measure in astronomy. More technically, it is the semi-major axis of the geocentric lunar orbit . The lunar distance is on average approximately 385,000 km (239,000 mi), or 1.28 light-seconds ; this is roughly 30 times Earth's diameter or 9.5 times Earth's ...

  5. Flight length - Wikipedia

    en.wikipedia.org/wiki/Flight_length

    Flight length. In aviation, the flight length or flight distance refers to the distance of a flight. Aircraft do not necessarily follow the great-circle distance, but may opt for a longer route due to weather, traffic, to utilise a jet stream, or to refuel. Commercial flights are often categorized into long-, medium- or short-haul by commercial ...

  6. Spacetime - Wikipedia

    en.wikipedia.org/wiki/Spacetime

    Terence is an official at the starting line, while Stella is a participant. At time t = t ′ = 0, Stella's spaceship accelerates instantaneously to a speed of 0.5 c. The distance from Earth to Mars is 300 light-seconds (about 90.0 × 10 6 km). Terence observes Stella crossing the finish-line clock at t = 600.00 s.

  7. Distance measure - Wikipedia

    en.wikipedia.org/wiki/Distance_measure

    In standard cosmology, comoving distance and proper distance are two closely related distance measures used by cosmologists to measure distances between objects; the comoving distance is the proper distance at the present time. [citation needed] The comoving distance (with a small correction for our own motion) is the distance that would be ...

  8. Hubble's law - Wikipedia

    en.wikipedia.org/wiki/Hubble's_law

    Over long periods of time, the dynamics are complicated by general relativity, dark energy, inflation, etc., as explained above. Hubble length. The Hubble length or Hubble distance is a unit of distance in cosmology, defined as — the speed of light multiplied by the Hubble time. It is equivalent to 4,420 million parsecs or 14.4 billion light ...

  9. Time dilation - Wikipedia

    en.wikipedia.org/wiki/Time_dilation

    Time dilation. Time dilation is the difference in elapsed time as measured by two clocks, either because of a relative velocity between them ( special relativity ), or a difference in gravitational potential between their locations ( general relativity ). When unspecified, "time dilation" usually refers to the effect due to velocity.

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