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Page Title: Chapter 5 Basics of Time
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CHAPTER 5 Basics of Time Introduction In  this  chapter  you  will  be  introduced  to  the  basics  of  time.  You  may  be asking  yourself  what  part  time  plays  in  the  practice  of  navigation.  You may  be  surprised  to  find  out  how  important  time  actually  is.  For example, when we use time to mark the exact second of celestial observation an error of a few seconds could result in a fix error of many miles from the correct fix position. Objectives The material in this chapter will enable the student to: Define the terms  apparent  and  mean  solar time. Match the following kinds of time with their definitions: a.  Greenwich  mean  time  (GMT) b.  Universal  time  (UT) c.  Local  mean  time  (LMT) d.  Zone  time  (ZT) e.  Zone  description  (ZD) State why standard time zones are used and how they are measured. Calculate ZD from ship’s longitude. State the procedures for adjusting a ship’s time and date at sea. Convert ZT to GMT. Convert GMT to ZT. Identify the equivalent values for arc and time. Convert time to arc and arc to time manually. Convert arc to time using  The Nautical Almanac. 5-l

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