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    Re: Sunset Intercepts
    From: Greg Rudzinski
    Date: 2012 Aug 3, 10:38 -0700

    Kermit,

    Refraction values seem to vary with NAs, apps, and on-line computers when using hs 0* as an entry.

    Naval Observatory NA -33.8'
    Tamaya NC-77 -34.8'
    Palm Pilot -34.4'
    Umland (on-line) -34.0'
    Wise (on-line) -33.8'

    The NA standard- temp 10*C press. 1013 mb (29.93 in.). Any deviation from standard changes values noticeably.

    Greg Rudzinski


    [NavList] Re: Sunset Intercepts
    From: Antoine Couëtte
    Date: 3 Aug 2012 08:46
    Thanks Greg.

    Under standard conditions, I find I/Az = +0.5 NM T /291°8

    The intercept difference (you found +1.1 T) seems mostly due to refraction, then.

    I am aware that the Nautical US and French Refraction tables differ by 0.5' or 0'6 for Altitude 0°, and that above 5° they differ by less than 0'1.

    Thanks again, Greg, and

    Have a Great Day

    Kermit
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