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  2. Jet lag - Wikipedia

    en.wikipedia.org/wiki/Jet_lag

    If the absolute time difference between two locations is greater than 12 hours, one must subtract 24 from or add 24 to that number. For example, the time zone UTC+14 will be at the same time of day as UTC−10, though the former is one day ahead of the latter. Jet lag is linked only to the distance travelled along the east–west axis.

  3. This Is the Real Difference Between “Less” and “Fewer”

    www.aol.com/real-difference-between-less-fewer...

    This is because this sentence refers to “two hours” as a lump sum of time, not as individual hours. ... this phrase is actually grammatically incorrect—it should say “ten items or fewer ...

  4. Distance - Wikipedia

    en.wikipedia.org/wiki/Distance

    The distance between sets A and B is the infimum of the distances between any two of their respective points: (,) =, (,). This does not define a metric on the set of such subsets: the distance between overlapping sets is zero, and this distance does not satisfy the triangle inequality for any metric space with two or more points (consider the ...

  5. Gravity model of migration - Wikipedia

    en.wikipedia.org/wiki/Gravity_model_of_migration

    The gravity model of migration is a model in urban geography derived from Newton's law of gravity, and used to predict the degree of migration interaction between two places. [1] In 1941, astrophysicist John Q. Stewart [ 2 ] applied Newton's law to the social sciences, establishing a theoretical foundation for the field of social physics.

  6. Time dilation - Wikipedia

    en.wikipedia.org/wiki/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.

  7. Length measurement - Wikipedia

    en.wikipedia.org/wiki/Length_measurement

    The time interval between the sending and the receiving of a pulse is monitored and used to determine a distance. In the global positioning system a code of ones and zeros is emitted at a known time from multiple satellites, and their times of arrival are noted at a receiver along with the time they were sent (encoded in the messages).

  8. Fewer versus less - Wikipedia

    en.wikipedia.org/wiki/Fewer_versus_less

    Fewer versus less is a debate in English grammar about the appropriate use of these two determiners. Linguistic prescriptivists usually say that fewer and not less should be used with countable nouns , [ 2 ] and that less should be used only with uncountable nouns .

  9. Great-circle distance - Wikipedia

    en.wikipedia.org/wiki/Great-circle_distance

    A diagram illustrating great-circle distance (drawn in red) between two points on a sphere, P and Q. Two antipodal points, u and v are also shown. The great-circle distance, orthodromic distance, or spherical distance is the distance between two points on a sphere, measured along the great-circle arc between them. This arc is the shortest path ...