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, 21:03 -0700
From: Parsa
Date: 2007 Sep 27, 21:03 -0700
I just checked the CelestNav web site: http://www.mobilegeographics.com/celestnav/tutorial.html#indexerror It shows under "Show Corrections" that IE is changed to I.C. by changing the sign. That page on my Palm shows a Dip correction of -2.6, and a refraction correction of -3.6. That accounts for +0.2' of the difference. The remaining +0.3' is due to the fact that it does not include the 0.3 correction for Venus. I don't know why though. Parsa On Sep 27, 8:36 pm, Parsawrote: > George, thanks for your comments. > In regards to the sextant sight corrections, you may be right about > the difference between I.C. and IE. The text of "100 Problems" has > I.C.= -1.2'. > I assumed this to mean this was the correction to be applied, in other > words it is "on" the arc and therefore needs to be subtracted from the > sextant reading. > The CelestNav program has IE, and when I have a large negative value, > it makes Ho larger, but when I have a large positive value, it makes > Ho smaller. So I think it should be changed in sign. > When I do that I get 15 07.9', which is much closer to my 15 08.4'. > The difference my be from the equations used by the software and > rounding in the almanac table. > > I regards to the moon, yes I know it swings all over and has a lot of > other crazy wobbling to boot. I'll watch my table declinations and > signs closely. > > Thanks > Parsa --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to NavList@fer3.com To , send email to NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---