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Page Title: How to Convert Arc to Time Using The Nautical Almanac
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How to Convert Time - 14221_157
How to Convert Arc to Time Using The Nautical Almanac Example In the following example, you will learn how to convert arc to time using a table from The Nautical Almanac. Example:  Suppose  your  DR  longitude  is  142°  41'  W,  and  ZT  is  06h  21m 09s.  Divide  142°  41'  by  15,  and  you  find  that  your  ZD  is  +10.  This means  that  your  standard  meridian  must  be  150°W.  To  simplify  the arithmetic,  express  the  150°W  longitude  as  149°  60'  W.  The  values  are equal and subtraction is made easier this way. Standard time meridian 149°60'  W Longitude your meridian 142°41' Difference of Longitude 7°19' Using  the  conversion  of  arc  to  time  excerpt  shown  in  figure  5-4,  change 7°  19'  to  time,  and  you  get  00h  29m  16s.  This  means  that  LMT  at  your meridian differs from ZT by 00h 29m 16s. Figure  5-4.  Excerpt  from  The  Nautical  Almanac. 5-10

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