NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Arctic circle
From: R.H. van Gent
Date: 2006 Jul 6, 03:28 -0500
From: R.H. van Gent
Date: 2006 Jul 6, 03:28 -0500
Hi Herbert, Thank you very much for your detailed reply. I had checked Meeus' 'Morsels' but not his 'Astronomical Algorithms'. The numbers are accurate enough for my purpose. As the obliquity of the ecliptic is currently slowly diminishing, the arctic and tropical circles are moving away from each other at circa 30 metres per year, so greater accuracy would be meaningless. I read some where that because of this the polar and tropical regions are diminishing in size at a rate of 470 and 1080 sq km per year. In consequence, the temperate region grows at a rate of 1550 sq km per year. Now, who knows a country, state, island or lake of roughly the same size? Rob van Gent --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to NavList@fer3.com To , send email to NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---
