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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Greg Herdt
Date: 2023 Apr 7, 17:16 -0700
Below please find the correct data that should have gone out with my post on April 6. Apologies for the error and thanks to Paul Hirose for calling this to my attention.
Here are the raw data from my shots on April 6 (times in GMT) for those who might be interested:
Shooting from Rio Rancho, NM, Lat 35° 18.0' N Long 106° 35.0' W
The air pressure in Rio Rancho (ca. 5280 ft above Sea Level) is about 0.83x of Sea Level. I used 29.8x0.83 = 24.73 inches of pressure and 45°F (temp when I was shooting last night) in Frank's Lunar App.
Lunar distance measured with a Cassens and Plath Standard Sextant with a 6x30 scope, IC=-0.2'
Altitude of Regulus and the Moon measured with an Celestaire Astra Pro with a Cassens and Plath Professional Bubble Horizon attachement, IC=21.6. I usually get within ca. +/-2' or so with this unit averaging seven shots, but I used less shots last night in the interests of expediency (had to get up and good to work early today). This is also why I shot the moon at such a low altitude, which I would normally avoid.
April 6, 2023 (GMT)
Regulus (pre, adjusted for IC)
02:42:35 57° 59.4
02:43:59 58° 07.4
02:45:01 58° 14.6
Moon LL (pre, adjusted for IC)
02:49:03 16° 35.4
02:50:09 16° 49.2
02:52:35 17° 27.1
Regulus-Moon (near) NOT adjusted for IC
02:57:20 45° 40.85
02:58:35 45° 41.1
02:59:41 45° 41.3
03:00:53 45° 41.6
Moon LL (post, adjusted for IC)
03:02:38 18° 57.3
03:03:47 19° 31.0
03:05:06 19° 46.0
03:06:10 19° 47.2
Regulus (post, adjusted for IC)
03:08:20 61° 40.9
03:10:33 61° 54.0
03:11:48 62° 01.2
03:12:57 62° 06.0
Note that I used sets of three shots for the pre-lunar altitudes and sets of four shots for the post-lunar altitudes. This was not on purpose: I originally meant to maintain a symmetry in these shots to center the average of altitudes near the average time of the lunars. This may have skewed my results a bit.
