NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Greg Rudzinski
Date: 2016 Jan 29, 14:17 -0800
Norm,
Attached is an artificial horizon snap of the Sun using variable filtering. The Sun came through as a pair of blobs through the overcast. Picking the center by eye seems to work.
Given:
1/29/2016 21:37:14 UT Lat. 27° 41.1' N Lon. 80° 23.9' W
.56 ( 3412 px ) = 1910.7' = 31° 50.7' - 20.4' corr. = 31° 30.3' Hs artificial horizon
Hs 15° 45.1' - 3.3' refraction = Ho 15° 41.8'
Hc 15° 41.3'
Ho 15° 41.8'
intercept 0.5' toward
azimuth 239.5°
LHA 60° 38.4'
DEC 17° 53.7' S
LAT 27° 41.1' N
Greg Rudzinski
From: Norm Goldblatt
Date: 2016 Jan 29, 09:55 -0800Ive been using ImageJ for a number of many scientific projects, as well as an attempt to calibrate my iPhone camera. Very easily locate the center of a bright pixel area, as it is easy to get a profile of a multipixel bright area.
