NavList:

Dear John,

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.

Thanks again!

Warm regards,

Tony