NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Ed Popko
Date: 2018 Feb 2, 13:32 -0800
On a recent winter escape to Central Florida, I had opportunities to shoot many moon-sun and moon-star lunars. Below are are some moon-sun shots. I'll post a second set with moon-Aldebaran and moon-Pollux shots.
I had better luck than I deserve and walked away with some techniques that made shooting lunars both easier and more accurate. For the cases below, I used Frank’s Lunars Calculator though I also worked them by the Bowditch-Thompson method and Frank’s ‘Lunars are Easy’ algorithms, both taught in his Lunars Workshop at Mystic Seaport. The results were quite good.
Date January 24, 2018 Moon-Sun (near limb)
KP Lat 28 41.1’ Lon 082 18.3’
Moon waxing, near limbs sighted
WE 00”
IE 0.0’
Reed’s
Sight No. GMT LDa LD Pre-Cleared Calculated Error LD Cleared
1 19:34:36 88º 33.2’ 89º 05.4’ 0.6’ 88 34.4’
2 19:36:06 88º 33.4’ 89º 05.6’ 0.2’ 88 34.8’
3 19:37:01 88º 33.4’ 89º 05.6’ -0.2’ 88 34.9’
4 19:38:00 88º 33.9’ 89º 06.1’ -0.1’ 88 35.5’
5 19:39:14 88º 34.1’ 89º 06.3’ -0.4 88 35.8
6 19:40:18 88º 35.0’ 89º 07.2’ 0.0’ 88 36.8
Average
1-6 19:37:33 88 33.8’ 89 06.0’ 0.1’ 88 35.3
LD GMT Time Bracket
Interpolated Interpolated GMT
GMT Cleared LD GMT vs Observation GMT
19:00:00 88º 15.9’
1 88º 34.4’ 19:35:41 00:01:05 fast ... could have rejected this one
2 88º 34.8’ 19:36:28 00:00:22 fast
3 88º 34.9’ 19:36:39 00:00:22 slow
4 88º 35.5’ 19:37:49 00:00:11 slow
5 88º 35.8’ 19:38:24 00:00:50 fast
6 88º 36.8’ 19:40:19 00:00:01 fast
1-6 88º 35.3’ 19:37:26 00:00:02 slow
20:00:00 88º 47.0’
