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Definition of Terms - 14221_151
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Quartermaster 3 & 2 - Military manual for the Quartermaster rate
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The Relationship between Time and Longitude - 14221_153
Standard Time Zones Introduction You  can  understand  how  a  general  foul-up  would  result  if  all  people  set their  watch  on  their  own  LMT.  As  you  know,  local  mean  time  (LMT) always  differs  in  different  longitudes.  In  a  large  city,  for  example,  a difference  of  about  9  seconds  (9s)  LMT  occurs  between  one  end  of  the city  and  the  other  end.  If  you  set  your  watch  on  your  LMT  you  would have to change it every time you went a few blocks on a street running east and west. To  eliminate  this  difficulty,  standard  time  zones  have  been  established within  which  all  clocks  are  set  to  the  same  time,  zone  time  (ZT).  A difference  of  1  hour  (lh)  takes  place  between  one  time  zone  and  the  next. Because  1h  is  15°,  you  can  see  that  each  time  zone  comprises  15°  of longitude.  Thus  resulting  in  24  time  zones,  and  25  time  zone designations. Figure  5-3.  Time  zones. Local  mean  time  along  each  standard  time  meridian  is  zone  time  for  the entire  time  zone.  Look  at  figure  5-3.  In  zone  0,  time  is  exactly  the  same within  7  1/2°  either  side  of  the  standard  meridian.  Zone  time  in navigation  is  abbreviated  ZT. Daylight savings time is simple zone time set ahead 1 hour to extend the time of daylight. 5-6

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