GREENWICH MEAN TIME.
~ m , CHANGE IN CALCULATION. MIDNIGHT TO MIDNIGHT. The time reckoned on vessels at sea is quite different from that used on shore. On board a ship for navigation problems astronomical time, from noon on one day to the noon of the following day, is used, neon being the time that the sun has reached its highest altitude at the place •where the vessel is at that moment. The longitude is then determined by a calculation 'of the difference jjn the time at ship and Greenwich mean'time. Up to the present Greenwich mean time has been the same a 8 astronomical time, from noon to noon. This, however, is to be changed and ultimately Greenwich mean time will be reckoned the same aa civil time, midnight tp midnight. In the Juno notices to mariners, jssued by the Admiralty, it |is announced that the new system will j come into operation in 1925. ,
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New Zealand Herald, Volume LIX, Issue 18171, 17 August 1922, Page 9
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154GREENWICH MEAN TIME. New Zealand Herald, Volume LIX, Issue 18171, 17 August 1922, Page 9
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