NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Exercise #16 High Altitude Sights near Noon
From: Hewitt Schlereth
Date: 2008 Jul 20, 15:47 -0400
From: Hewitt Schlereth
Date: 2008 Jul 20, 15:47 -0400
152 NM is a mistype on my part. It should be 1*52' - the zenith distance of the1112 sight, which just happened to be the maximum extension of my compass. The method I used was to advance the two circles-of-position, the 1112 having a radius of 1*52' and the 1121 a radius of 1*26.1'. HewS On 7/20/08, Anabasis75@aol.comwrote: > > Thanks for trying this Hew! > > I'm a big confused how you get the number "152 nm?" The 1112 sight has an > HO of 88 deg 06'. That should equal a zenith distance of 1 deg 54' or 114' > minutes/nm. The 1121 sight has a Z-dis of 86.1 minutes/nm. The only thing > I can think of is that you have a different method of advancing the LOP's to > noon? > > I'll post the correct answer with my method of solution in a few days. > > Jeremy > > In a message dated 7/18/2008 9:13:31 P.M. Eastern Daylight Time, > hhew36@gmail.com writes: > > Your example from the CG test intrigued me because it's a case of > altitudes so high you can put the GPs down on a plotting sheet, swing > the arcs of the zenith distances and use the DR to choose which of the > two points where the arcs intersect to decide which point is the fix. > > I did this on a VP-OS Universal Plotting Sheet - the one where a NM is > about one millimeter. Because I don't have a compass large enough to > draw an arc with a radius of over 152 NM, I couldn't change the scale. > > Anyway, I came up with a position of 19*22' S, 6*38' E, which is very > close to the 1200 DR of 19*20.3' S, 6*39.3' E. Closest position on the > answer sheet is A. > > Check me on this, if you've got the time. > > Thanks, HewS > > > > > > ________________________________ > Get fantasy football with free live scoring. Sign up for FanHouse Fantasy > Football today. > > > --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---