On 2nd Sept 2008, in DR 40˚ 28’N 064˚ 20’E, the rising sun bore 090˚(C). If variation was 5˚ W, find the deviation of the compass.
LMT Sunrise = 2d 05h 28m 00s
LIT (E) = (-) 04h 17m 20s
GMT Sunrise = 2d 01h 10m 40s
Dec (sun ) 2d 01h 10m 40s
= 07˚ 50.3’ N
As we know that:
LMT of Sunrise or Sunset are taken from the nautical almanac and needs only be interpolated and taken in whole minutes of time. If the time ofobservation is given in the problem, then given time should be used for calculation. It is necessary to remove the ambiquity of chron time.
We know that:
In question number 4 of exercise 29 (RSAz Sun) the LMT should be 30d 07h 33m 00s
LMT should be 30D 07h 35m 58s ……….. and Dec is S 21deg 40.1′