NAMING OF AMPLITUDE: The prefix of True Amplitude is E if the body is rising and W if the body is setting. The suffix is same as that of the declination.
T Az = 234.0˚ (T)
C Az = 234.0˚ (C)
Error = NIL
Variation = 03˚ W
Deviation = 3.0 W
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Nov 30th 2008, the sun rose bearing 110˚(C) in DR 49˚ 18’N 110˚ 12’E at 00h 10m 00schron time. If chron error was 05m 10s SLOW and variation was 10˚E, find the deviation of the compass.
LMT Sunrise = 30d 07h 35m 00s
LIT (E) = (-) 07h 20m 48s
GMT Sunrise = 30d00h 14m 12s
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.
Dec sun 30d 07h = S 21˚40.0’
d(-0.4) = – 00.1’
Dec 2d 06h 37m 00s = S21˚ 39.9’
We know that :
Rising Az = E 34.5˚S
T Az = 124.5˚ (T)
C Az = 110.0˚ (C)
Error = 14.5˚ E
Variation = 10˚ E
Deviation = 4.5˚E
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′