NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Going Loony with Lunars
From: Stan K
Date: 2017 Dec 12, 20:01 -0500
From: Stan K
Date: 2017 Dec 12, 20:01 -0500
Frank,
You said, "For Near Limb sights (always for the Sun!)..." What if the near limb of the Sun is obscured by a cloud? Just wait?
Stan
-----Original Message-----
From: Frank Reed <NoReply_FrankReed@fer3.com>
To: slk1000 <slk1000@aol.com>
Sent: Tue, Dec 12, 2017 6:10 pm
Subject: [NavList] Re: Going Loony with Lunars
From: Frank Reed <NoReply_FrankReed@fer3.com>
To: slk1000 <slk1000@aol.com>
Sent: Tue, Dec 12, 2017 6:10 pm
Subject: [NavList] Re: Going Loony with Lunars
Another visual test to play around with: Look at the Moon's terminator and its "horns". If the horns of the Moon are aligned vertically, then the lunar necessarily leaves the Moon horizontally on its way to the Sun and nearly so for any other star or planet reasonably close to the ecliptic. Otherwise, picture a line through the horns and then aim 90° away, left or right, depending on whether it's a Near or Far limb sight. For Near Limb sights (always for the Sun!), if the center of the illuminated edge of the Moon points down, then the lunar arc is descending as it leaves the Moon, and a descending lunar arc implies that the clearing process increases the distance.
Frank Reed
