NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Try a lunar
From: Frank Reed CT
Date: 2003 Dec 12, 18:07 EST
From: Frank Reed CT
Date: 2003 Dec 12, 18:07 EST
Care to try your hand at reducing last night's lunar?
Having returned from an 800 mile voyage and seeing that the Moon was "in distance" with my favorite lunar star, Aldebaren, I decided to confirm my chronometer's time by shooting the Moon. Here's the setup. My DR position is US zip code 06355 (a little challenge). I used my plastic sextant. I set it out in the cold for fifteen minutes before sights to stabilize it thermally. Air temperature was 40 degrees F, air pressure was 29.50 inches, and the wind was blowing at 25mph. I managed to get an index correction with one shade down by using Sirius. The index error was 5.8 minutes on the arc (surprisingly stable and repeated between each individual lunar).
Four lunars averaged yield:
Moon (Far Limb)-Aldebaren: 49d 59.7 at 01:17:30 Eastern Standard Time.
Interpolated altitudes for the same time:
Aldebaren: 51d 43
Moon LL: 68d 02
So based on this lunar, what is my revised zip code and where should I forward my mail?? ;-D
Frank E. Reed
[X] Somewhere near Mystic, Connecticut
[ ] Chicago, Illinois
Having returned from an 800 mile voyage and seeing that the Moon was "in distance" with my favorite lunar star, Aldebaren, I decided to confirm my chronometer's time by shooting the Moon. Here's the setup. My DR position is US zip code 06355 (a little challenge). I used my plastic sextant. I set it out in the cold for fifteen minutes before sights to stabilize it thermally. Air temperature was 40 degrees F, air pressure was 29.50 inches, and the wind was blowing at 25mph. I managed to get an index correction with one shade down by using Sirius. The index error was 5.8 minutes on the arc (surprisingly stable and repeated between each individual lunar).
Four lunars averaged yield:
Moon (Far Limb)-Aldebaren: 49d 59.7 at 01:17:30 Eastern Standard Time.
Interpolated altitudes for the same time:
Aldebaren: 51d 43
Moon LL: 68d 02
So based on this lunar, what is my revised zip code and where should I forward my mail?? ;-D
Frank E. Reed
[X] Somewhere near Mystic, Connecticut
[ ] Chicago, Illinois
