NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Planet rising revisited
From: Lars Tornqvist
Date: 2002 Feb 5, 22:55 -0000
From: Lars Tornqvist
Date: 2002 Feb 5, 22:55 -0000
Hi Dave All objects at their rising position are farest away (90deg or 5400 Nm away) - meaning it's perfect for an azimut! Azimuts are used for compas corrections. You don't need the exact time for an exact azimut - and furthermore your own position does not need to be exactly to obtain a good azimuth! Two Objects which is 5400 miles away will have the same bearing within a broard margin of position Imagine that you are in London and could see the Statue of Liberty in N.Y If you take a bearing of the Statue and walk south 5 miles the bearing will still be the same or impossible to detect by your compas! Nowadays we take azimuts with high precisions due to precise clocks and knowledge positions etc. The rise of an object in the old days was very important as the knowledge of magnetic variation was poor or none - an azimut as often as possible was certainly a great need those days! Hope this will do. Lars ----- Original Message ----- From: daveweilacher@earthlink.netTo: Sent: Tuesday, February 05, 2002 10:19 PM Subject: Planet rising revisited > What practical use would a navigator have for determining when a planet would rise? (other than at twilight) > > Dave > > > > -------------------------------------------------------------------- > mail2web - Check your email from the web at > http://mail2web.com/ .