NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Index Error
From: Gary Harkins
Date: 2004 May 5, 18:59 EDT
From: Gary Harkins
Date: 2004 May 5, 18:59 EDT
In a message dated 5/5/2004 10:21:53 AM Eastern Standard Time, enoid@NUNANET.COM writes:
I am baffled. Additional comments welcome.
One mistake you are making is subtracting out the index correction. Since you are joining opposite limbs of the sun, it is the total distance that you are concerned about. For example, if you had a really terrible index correction of -1 degree you would have both limb sightings on the arc. For determining semi-diameter this would not matter as it is the total difference divided by four. Applying the index correction when you are trying to figure out the semi-diameter not proper. For normal sights it is of course necessary.
Gary Harkins C400 #140 "Cygnus"
Website http://www.hometown.aol.com/htycgary/myhomepage/index.html
Harbour Towne Marina, Muskegon, Michigan Slip C-28
Harbour Towne Yacht Club, Life Member
C400 National Association
United States Power Squadrons-JN
NRA Life Member
MCRGO (Michigan Coalition for Responsible Gun Owners)
JPFO (Jews for the Preservation of Firearms Ownership)
Website http://www.hometown.aol.com/htycgary/myhomepage/index.html
Harbour Towne Marina, Muskegon, Michigan Slip C-28
Harbour Towne Yacht Club, Life Member
C400 National Association
United States Power Squadrons-JN
NRA Life Member
MCRGO (Michigan Coalition for Responsible Gun Owners)
JPFO (Jews for the Preservation of Firearms Ownership)
