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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Ed Popko
Date: 2018 Feb 3, 04:29 -0800
Below are my Moon-Aldebaran shots taken on January 21, 2018.
The work setup could not have been better. The viewing area was quite open, very clear and dark sky. I used the hood of my car as a work table. Propping up my Sansung tablet with Frank's GPS Anti Spoof Pro timer running. It also illuminates my notebook for recording sights. Could lean on the car to steady my arms while taking sights.
In this series, I used my Astra IIIB sextant with 7x35 scope. It's much lighter than my C&P Horizon and easier to manouver and hold in the odd positions that taking a lunar often requires.
Date January 21, 2018 Moon-Aldebaran (far limb)
KP Lat 28 41.1’N Lon 082 18.3’W
Moon waxing, far limbs sighted, viewing conditions perfect
WE 00” using GPS Anti Spoof Pro timer (Samsung tablet on hood of car as work table)
IE=0.75’ (on arc)
Sextant Astra IIIB with 7x35 scope, Vernier interpolation to 0.1’ (a Stan Klein trick)
Raw Reed’s
Sight No. GMT LDs LD Pre-Cleared Calculated Error LD Cleared
1 23:34:02 74º 17.1’ 74º 00.9’ 0.3’ 73º 26.1’
2 23:36:49 74º 15.7’ 73º 59.5’ -0.1’ 73º 24.3’
3 23:38:47 74º 15.1’ 73º 59.0’ 0.1’ 73º 23.4’
4 23:40:55 74º 14.4’ 73º 58.2’ 0.2’ 73º 22.4’
5 23:42:59 74º 14.0’ 73º 57.8’ 0.5’ 73º 21.7’
6 23:44:38 74º 12.8’ 73º 56.7’ - 0.1’ 73º 20.2’
LD GMT Time Bracket
Interpolated Interpolated GMT
GMT Cleared LD GMT vs Observation GMT
23:00:00 73º 43.7’
1 73º 26.1’ 23:33:31 00:00:31 slow
2 73º 24.3’ 23:36:57 00:00:08 fast
3 73º 23.4’ 23:38:40 00:00:07 slow
4 73º 22.4’ 23:40:34 00:00:21 slow
5 73º 21.7’ 23:41:54 00:01:05 slow ...... worst case
6 73º 20.2’ 23:44:46 00:00:08 fast
24:00:00 73º 12.2’
Popko
