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    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{at}ATT.NET writes:

    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
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