NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Peter Hakel
Date: 2011 Jan 4, 22:02 -0800
Lat: N 34d 10.6'
Lon: W 118d 49.7'
The parabolic fit places the transit at UT=00:49:35, which is slightly before the time
obtained from your AP longitude at: UT=00:51:10.
Peter Hakel
From: Greg Rudzinski <gregrudzinski@yahoo.com>
To: NavList@fer3.com
Sent: Tue, January 4, 2011 7:02:06 PM
Subject: [NavList] Daytime Jupiter Ex-Meridian/ M.P. /LOP Exercise
5 Jan 2011 A.P. 34° 09.5'N 119° 13.5'W H.E. 21 ft. I.E. 0.0' Cassens Plath w/ 4x40mm scope
Declination 2° 17.8' S
UT 00:41:25 Hs 53° 32.4' (8m 26s to M.P.)
UT 00:44:39 Hs 53° 35.2' (5m 12s to M.P.)
UT 00:46:21 Hs 53° 36.2' (3m 30s to M.P.)
UT 00:47:59 Hs 53° 36.4' (1m 52s to M.P.)
UT 00:49:51 Hs 53° 36.8' M.P. observed
UT 00:51:37 Hs 53° 36.5' (1m 46s from M.P.)
Comments: The weather and horizon were excellent but it was a struggle to find and set Jupiter on the horizon. Jupiter would disappear against the sky and had to be lowered into the sea for viewing. The whole horizon mirror was just able to do the job. Next time it will be the split mirror. I have my doubts that this observation could be performed on a small craft. Aboard ship shouldn't be a problem. I did use Byron's vertical sextant technique of rocking the body from horizon to horizon through the dark back
ground of the sea then splitting the difference to get the mid point.
Greg Rudzinski
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