International Date Line


International Date Line
a theoretical line following approximately the 180th meridian, the regions to the east of which are counted as being one day earlier in their calendar dates than the regions to the west.
Also, date line.

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Imaginary line from the North Pole to the South Pole that arbitrarily separates each calendar day from the next.

It corresponds along most of its length to the 180th meridian of longitude but deviates to the east through the Bering Strait to avoid dividing Siberia and then deviates to the west to include the Aleutian Islands with Alaska. South of the Equator, another eastward deviation allows certain island groups to have the same day as New Zealand. The date line is a consequence of the worldwide use of timekeeping systems arranged so that local noon corresponds approximately to the time at which the Sun crosses the local meridian of longitude. See also standard time.

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also called  Date Line 

      imaginary line extending between the North Pole and the South Pole and arbitrarily demarcating each calendar day from the next. It corresponds along most of its length to the 180th meridian of longitude but deviates eastward through the Bering Strait to avoid dividing Siberia and then deviates westward to include the Aleutian Islands with Alaska. South of the Equator, another eastward deviation allows certain island groups to have the same day as New Zealand.

      The International Date Line is a consequence of the worldwide use of timekeeping systems arranged so that local noon corresponds approximately to the time at which the Sun crosses the local meridian of longitude (see standard time). A traveler going completely around the Earth, carrying a clock that he advanced or retarded by one hour whenever he entered a new time zone and a calendar that he advanced by one day whenever his clock indicated midnight, would find on returning to his starting point that the date according to his own experience was different by one day from that kept by persons who had remained at the starting point. The International Date Line provides a standard means of making the needed readjustment: a traveler moving eastward across the line sets his calendar back one day, and one traveling westward sets his a day ahead.

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Universalium. 2010.

Look at other dictionaries:

  • International Date Line — Date line redirects here. For other uses, see Dateline (disambiguation). The International Date Line around 180° The International Date Line (IDL) is a generally north south imaginary line on the surface of the Earth, passing through the middle… …   Wikipedia

  • International Date Line — Date line Date line The hypothetical line on the surface of the earth fixed by international or general agreement as a boundary on one side of which the same day shall have a different name and date in the calendar from its name and date on the… …   The Collaborative International Dictionary of English

  • international date line — n. [often I D L ] an imaginary line drawn north and south through the Pacific Ocean, largely along the 180th meridian: at this line, by international agreement, each calendar day begins at midnight, so that when it is Sunday just west of the line …   English World dictionary

  • International Date Line — n [singular] an imaginary line that goes from the ↑North Pole to the ↑South Pole, to the east of which the date is one day later than it is to the west …   Dictionary of contemporary English

  • International Date Line — ► NOUN ▪ an imaginary North South line through the Pacific Ocean, chiefly along the meridian furthest from Greenwich, to the east of which the date is a day earlier than it is to the west …   English terms dictionary

  • International Date Line — noun an imaginary line on the surface of the earth following (approximately) the 180th meridian • Syn: ↑dateline, ↑date line • Instance Hypernyms: ↑meridian, ↑line of longitude * * * noun the international date line …   Useful english dictionary

  • international date line — The Greenwich antimeridian, or 180° longitude. The international date line, however, does not follow the Greenwich antimeridian exactly but is distorted to place inhabited areas definitely on one side or the other of the line to avoid a… …   Aviation dictionary

  • international date line — tarptautinė demarkacinė paros laiko linija statusas T sritis Gynyba apibrėžtis Linija, apytiksliai sutampanti su 180 laipsnių dienovidiniu (priešingas Grinvičo dienovidiniui) ir aplenkianti tam tikras gyvenamąsias teritorijas. Kertant šią liniją …   NATO terminų aiškinamasis žodynas

  • international date line — The line coinciding approximately with the anti meridian of Greenwich, modified to avoid certain habitable land. In crossing this line there is a date change of one day. Also called date line …   Military dictionary

  • International Date Line — In′terna′tional Date′ Line n. hor a theoretical line following approximately the 180th meridian, the regions to the east of which are counted as being one day earlier in their calendar dates than the regions to the west …   From formal English to slang


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