A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Tony Oz
Date: 2016 Nov 3, 14:41 -0700
Thanks for reassuring me! :)
Yes, one can/should have a quick look at his compass for the azimuth estimation. But for now I would consider that as cheating. I'd like to understand the basics of it.
I do understand that Jupiter was to the east of me, so t should be positive. May be this is just a quirk of the work-sheet since it is not official after all. The work-sheet and all the tables are "homebrew", so to say.
So, the lesson I must take from this is: to always calculate LHA counting from me to an object WESTWARDS. I.e. - LHA is not an arithmetic summ of GHA with LonAP.
Now back to the given work-sheet: since LHA is nowhere actually used - the step 1 should probably be re-phrased to calculate t from GHA and LonAP respecting +/- sign of LonAP operand. Then in my case t would be positive and I get the correct Zc in step 8.