NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: R: Re: R: Solutions to Gray's 100 Problems (Problem 1-1)
From: Parsa
Date: 2007 Sep 27, 11:57 -0700
From: Parsa
Date: 2007 Sep 27, 11:57 -0700
Well, I figured out where I went wrong with the moon.... Any guesses? The same thing my physics students do... sign error! Declination, declination, declination. It's more important for calculated height. First mistake: I did not examine the almanac to note that declination was decreasing, which it does in May. I should have subtracted 7.7 minutes instead of adding. Second mistake: I also did not note that for LHA=336 degrees the difference was going down as declination increased. In other words I ignored the little negative sign. It was given on the nearby d values, but not on the one I looked at, so I added to the tabulated height when I should have subtracted. Third mistake: I did not even add the right number. I used the declination for the hour instead of the corrected declination for hours and minutes. When I fixed everything, I was very close (about one minute) to the value on my PDA. Now the LOP for the moon is acceptable. I won't make that mistake again soon. On to the next problem... --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to NavList@fer3.com To , send email to NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---