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Yes, Marcel, they are on page 280 of the 2013 edition.

Hewitt

Sent from my iPad

On Apr 8, 2013, at 1:10 PM, "Paul Hirose"  wrote:

> Marcel Tschudin wrote:
>> The refraction formula is indeed the one from Bennett in a form which
>> provides the resutls in degrees. Bennett provided also a second
>> formula for further improving the result of this first formula. Does
>> your N.A. 1998 edition makes reference to it?
> 
> There's no reference to a more accurate formula.
> 
> The formula (including the corrections for pressure and temperature)
> duplicates the almanac's high and low altitude refraction
> tables within 0.1′ for the values I tried, assuming 10 C and 1010 mb. I
> didn't test the almanac table A4 corrections for nonstandard conditions.
> 
>> Just in case these finding should one day be documented in a paper:
>> How is the correct reference to this N.A. edition?
> 
> 1998 Nautical Almanac Commercial Edition, published jointly by Paradise
> Cay Publication and Celestaire Inc., "Sight Reduction Procedures"
> chapter, p. 280.
> 
> Does anyone have a newer almanac? Are the refraction and dip formulae
> still included?
> 
> --
> 
> 
> : http://fer3.com/arc/m2.aspx?i=123455
> 
> 

   

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