NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Yosemite Falls moonbow
From: Keith Pickering
Date: 2011 Apr 12, 07:51 -0700
From: P H <pmh099@yahoo.com>
To: NavList <NavList@fer3.com>
Sent: Mon, April 11, 2011 8:06:38 PM
Subject: [NavList] Yosemite Falls moonbow
From: Keith Pickering
Date: 2011 Apr 12, 07:51 -0700
Lovely photo, but the Moon's LHA is pre-transit, since the center of the moonbow is left (west) of the NCP, the Moon must be east of the meridian. No way to determine the time of night unless we knew the phase of the Moon, which cannot be determined here.
Keith Pickering
From: P H <pmh099@yahoo.com>
To: NavList <NavList@fer3.com>
Sent: Mon, April 11, 2011 8:06:38 PM
Subject: [NavList] Yosemite Falls moonbow
http://eloquentnature.wordpress.com/2011/04/10/yosemite-falls-moonbow/
I think that this image by Gary Hart could be of some interest to "CelNav by camera" enthusiasts. What kind of information can be extracted from it? Field distortions from the known vs. imaged distances between the stars of the Big Dipper? The location of true horizon in the picture from the (extrapolated) position of Polaris and known latitude of Yosemite? Using all this plus the moonbow to estimate Moon altitude and its LHA? (To me it looks like not long before LAM.)
Peter Hakel
I think that this image by Gary Hart could be of some interest to "CelNav by camera" enthusiasts. What kind of information can be extracted from it? Field distortions from the known vs. imaged distances between the stars of the Big Dipper? The location of true horizon in the picture from the (extrapolated) position of Polaris and known latitude of Yosemite? Using all this plus the moonbow to estimate Moon altitude and its LHA? (To me it looks like not long before LAM.)
Peter Hakel
