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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: No Nautical Almanac data during Aug 21st eclipse
From: Bill B
Date: 2017 Aug 19, 01:51 -0400
From: Bill B
Date: 2017 Aug 19, 01:51 -0400
On 8/18/2017 4:13 PM, Frank Reed wrote: > ...if anyone wants to fill in > those numbers for August 21, 2017, you can do so easily with the web app > at the UNSO web site here: > http://aa.usno.navy.mil/data/docs/celnavtable.php. Exactly my thinking Wednesday. (Your online almanac is handy if I'm not feeling lethargic.) At 41.75N 86.25W we are not in the totality path. I've been fortunate to witness a full eclipse in the past, but I did want to know the azimuths and range of altitudes for first-time-digital photographic purposes. After backing out the main and HP corrections from the moon HC, it appeares the moon will be lower than the sun when their azimuths match, so a perfect chance for rare upper-limb observations of both bodies. Hopefully a similar setup at LAN (34 minutes prior to max here), so time for two shots while the sun stalls out, albeit on the cusp of my sextant's range with an AH. I hope to calculate that scenario today. Unless I misread it, the semi diameter of the moon at full totality will be larger than the sun's, so a pretty sweet view for those lucky enough to be centered in the path.
