EXERCISE 29 — RISING/SETTING AZIMUTH -SUN (Numerical Solution)

  1. 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:

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