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Page Title: How to Determine Star Time and Selected Stars Using Pub 249 Vol I (Selected Stars), Continued
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Figure  6-5.  Excerpts  from  The  Nautical  Almanac - 14221_177
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Pub 249 Selected Stars Worksheet
How to Determine Star Time and Selected Stars Using Pub 249 Vol I (Selected Stars), Continued Step Action Result 1. Determine the time of sunset. 1841 2. Add 30 minutes to the time of sunset (star 1911 time).  Find  and  note  the  DR  position  for 1911. For our example we will use 36°14.0'N   069°04'W. 3. 4. Find  GMT  of  star  time  1911.  Remember to find GMT apply the ZD to LMT. From the left-hand pages of the  Nautical Almanac,  find  the  GHA  of  Aries. 00h 11m 02 Sep 91 339°39'.7 5. From  the  Increments  and  Corrections  pages find the page with 11m and then find the value for Aries for 00 seconds. 45'.5 6. Find the total GHA of Aries by adding the results from step 4 and 5 together. Remember to carry over 1 whole degree whenever the total minutes are greater than 60.  Ex.  85  -  60  =  25  carry  1°. 339°39'.7 + 2 ° 4 5 ' . 5 342°25'.2 7. Find the LHA of Aries by subtracting west longitude, or adding east longitude. 342°25'.2 -069°04'.5 273°21'.2 8. Round off DR lat. and LHA Aries to the DR  lat.  =  36°  N closest °. LHA  Aries  273° 9. Enter Pub 249 on the page for 36° N. 10. Record the values for Hc and Zn for each See example star for LHA Aries for 273° on a worksheet  on  next worksheet. page. 6-12

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