
NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Raw data for bubble
From: Bill B
Date: 2007 Mar 13, 23:02 -0500
From: Bill B
Date: 2007 Mar 13, 23:02 -0500
Bill queried: >> If I am that sure of my latitude, why >> not use a time site to extract longitude directly? Peter kindly responded: > You would need a number of bodies to get a fix. Here you need only > one, usually the sun (although, as with meridian passages, any body > can be used, assuming you can see it and the horizon). > > Its an alternative to a round of sights of stars at dawn or dusk; a > way to establish a position line that is a local line of longitude > using the one sight. Or, to be precise(!), the one series of sights of > one body over five minutes of time. I'm thinking latitude known, the time sight accomplishes the same thing. As would a current LOP reduction with a true compass bearing of 90/270 to the body. In all cases, the further off you AP latitude, the further off your longitude. > > There is one limitation in practice - its a summer-time only trick. In > winter months you may not find the sun at 90 or 270d. LOL. Ya think? Thanks Peter Bill --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to NavList@fer3.com To unsubscribe, send email to NavList-unsubscribe@fer3.com -~----------~----~----~----~------~----~------~--~---