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Marcel,

I expect that H.O. 249 is put out by the naval observatory.  Try going
to http://aa.usno.navy.mil/ going to the "About AA" page and the
"contact us" page.  You also might poke around at
http://www.nao.rl.ac.uk/.

Also, I don't believe relative humidity has much influence on
atmospheric refraction.  As George H. pointed out, it's a direct
function of density, which is primarily controlled by air temp and
pressure.

Fred

On Aug 13, 2005, at 10:00 AM, Marcel E. Tschudin wrote:

> While you were afloat, I transferred the data of table 6 (only the
> range 0ft
> to 35'000ft) into an Excel sheet. I actually also tried to get in
> contact
> with the authors of this table, unfortunately all efforts failed so
> far.
> Pub. No. 249 is originally from NIMA. It seems that after the
> reorganisation - NIMA either became or was merged with NGA - no one
> seems to
> know whom to contact, or indicating wrong e-mail addresses.

   

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