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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Selenelion, something new in eclipses
From: Stan K
Date: 2014 Oct 5, 18:53 -0400
From: Stan K
Date: 2014 Oct 5, 18:53 -0400
It isn't going to matter anyway. The astronomical black cloud that follows me for events like this is going to make it cloudy Wednesday morning, at least from wherever I am :-(
Stan
Stan
-----Original Message-----
From: Frank Reed <NoReply_FrankReed@fer3.com>
To: slk1000 <slk1000@aol.com>
Sent: Sun, Oct 5, 2014 5:17 pm
Subject: [NavList] Re: Selenelion, something new in eclipses
From: Frank Reed <NoReply_FrankReed@fer3.com>
To: slk1000 <slk1000@aol.com>
Sent: Sun, Oct 5, 2014 5:17 pm
Subject: [NavList] Re: Selenelion, something new in eclipses
Ha! Gary, you beat me to it by seconds.
From the article:
"Then again, sighting a selenelion might be problematic feat. Twenty-five years ago, in the August 1989 issue of Sky & Telescope, Bradley Schaefer, an astronomer who extensively studied the visibility of the moon when it was low in the sky, noted that the full moon only becomes visible when it is about 2 degrees up and the sun is about 2 degrees below the horizon."
"Then again, sighting a selenelion might be problematic feat. Twenty-five years ago, in the August 1989 issue of Sky & Telescope, Bradley Schaefer, an astronomer who extensively studied the visibility of the moon when it was low in the sky, noted that the full moon only becomes visible when it is about 2 degrees up and the sun is about 2 degrees below the horizon."
From here in New England, the Moon will be setting while fully eclipsed right at sunrise. This would be an opportunity to see that apparent violation of geometry (only apparent). But of course, this is actually impossible to see. The fully-eclipsed Moon is completely invisible when it's so close to the horizon.
-FER
