NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Standard sea level temperature and pressure
From: Gary Harkins
Date: 2003 Jan 13, 17:59 EST
In a message dated 1/13/2003 5:27:54 PM Eastern Standard Time, marc.bernstein@ATT.NET writes:
They can't be...refraction is an actual measurement of how much the atmosphere is bending light rays. 10C/1010mb has to cause NO additional bending of the light rays, not just a reference. If you compare column A with column N on any given row you will see that the values are the same, just opposite signs. If the values were different then I would say that 10C/1010mb was just a convenient reference. But since they are the same I would say that 10C/1010mb and other representations in G are causing no additional bending of the light.
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)
From: Gary Harkins
Date: 2003 Jan 13, 17:59 EST
Are the constants in the equation for calculating refraction set so that refraction is 0 at 10C/1010mb? If so they could also have been chosen to make it 0 for 15C/1013mb?
They can't be...refraction is an actual measurement of how much the atmosphere is bending light rays. 10C/1010mb has to cause NO additional bending of the light rays, not just a reference. If you compare column A with column N on any given row you will see that the values are the same, just opposite signs. If the values were different then I would say that 10C/1010mb was just a convenient reference. But since they are the same I would say that 10C/1010mb and other representations in G are causing no additional bending of the light.
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)
