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See also:ANTIPODES (Gr. avri, opposed to, and 7r6 es, feet) , a See also:term applied strictly to any two peoples or places on opposite sides of the See also:earth, so situated that a See also:line See also:drawn from the one to the other passes through the centre of the globe and forms a true See also:diameter . Any two places having this relation—as See also:London and, approximately, See also:Antipodes See also:Island, near New See also:Zealand—must be distant from each other by 180° of See also:longitude, and the one must be as many degrees to the See also:north of the See also:equator as the other is to the See also:south, in other words, the latitudes are numerically equal, but one is north and the other south . See also:Noon at the one See also:place is midnight at the other, the longest See also:day corresponds to the shortest, and See also:mid-See also:winter is contemporaneous with mid-summer . In the calculation of days and nights, midnight on the one See also:side may be regarded as corresponding to the noon either of the previous or of the following day . If a voyager See also:sail eastward, and thus anticipate the See also:sun, his dating will be twelve See also:hours in advance, while the reckoning of another who has been sailing westward will be as much in arrear . There will thus be a difference of twenty-four hours between the two when they meet . To avoid the confusion of See also:dates which would thus arise, it is necessary to determine a See also:meridian at which dates should be brought into agreement, i.e. a line the See also:crossing of which would involve the changing of the name of the day either forwards, when proceeding westwards, or backwards, when proceeding eastwards . Mariners have generally adopted the meridian 18o° from See also:Greenwich, situated in the Pacific Ocean, as a convenient line for co-ordinating dates . The so-called " See also:International Date Line," which is, however, practically only due to See also:American initiative, is designed to remove certain objections to the meridian of 18o° W., the most important of which is that See also:groups of islands lying about this meridian differ in date by a day although only a few See also:miles apart . Several forms have been suggested; these generally agree in retaining the meridian of 18o° in the mid Pacific, with a See also:bend in the north in See also:order to make the Aleutian Islands and See also:Alaska of the same See also:time as See also:America, and also in the south so as to bring certain of the South See also:Sea islands into line with See also:Australia and New Zealand . |
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