Author

Topic: Ex. 5.4 Sun Sight #2

Rich A

posted July 22, 2016 11:25 AM
I have a question about Ex. 5.4 Sun Sight #2 according to the answer sheet (pg. 223), the dvalue (for Section 2) is 0.5. Looking in the NA for 26 Jul 1978, the dvalue at the bottom of the page is +0.5. In Box 3, this gives you a dec of N19 21.9, instead of N19 22.7.
In the end, the difference of the bearing T/A from Zn comes out to .8. Its not a lot but I want to know if I am messed up in some way. Can you help? Thanks.
From: Lacey


Capt Steve Miller

posted July 22, 2016 11:57 AM
First, when determining the sign for the 'd' for the declination correction you must look at the Declination minutes of the day/hour in the problem then check the NEXT hour to see if the minutes value has gotten bigger or smaller. If bigger then the sign is (+), if smaller then the sign is (). In this problem the minutes are smaller thus the 'd' is 0.5'. Second the N19° 21.9' is correct  N19° 22.3'  0.4 ('d' correction for the 0.5 value) = N19° 21.9'.
From: Starpath


Rich A

posted July 22, 2016 01:18 PM
Got it  that makes sense. Thanks.
From: Lacey


