NavList:

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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