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Page Title: How to Determine Star Time and Selected Stars Using Pub 249 Vol I (Selected Stars)
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Figure  6-5.  Excerpts  from  The  Nautical  Almanac - 14221_177
How to Determine Star Time and Selected Stars Using Pub 249 Vol I (Selected Stars) Example Determining star time and selected stars for morning or evening observations  is  simple.  The  process  involves  finding  the  time  of  sunrise for  morning  observation  or  sunset  for  evening  observations.  Then  you find the LHA of Aries for the time of star time and record the data for the seven stars on a worksheet. Rule:  Add  30  minutes  to  the  time  of  sunset  to  determine  evening  star time,  subtract  45  minutes  from  sunrise  to  determine  morning  star  time. Example:  The ship is located at 36°14.0' N 069°14' W, the date is 01 Sep  91.  The  ship  is  on  course  090°T  and  is  keeping  +5R  time  zone. Discussion Although  there  are  other  methods  of  determining  which  navigational  stars are available for observations, using Pub 249 is the most widely used method.  In  step  10,  you  are  directed  to  record  the  values  for  Hc  (height computed) and Zn (the azimuth angle, or the true direction to point the sextant  towards)  on  a  worksheet.  At  the  time  of  publication,  there  is  NOT a  standard  worksheet  available  for  use.  A  recommended  format  is supplied  on  page  11.  Use  a  PC  word  processor  to  reproduce  this worksheet locally. Use figure 6-5 on the following page along with the example OPNAV form to find selected stars. 6-10

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