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Bowditch (1909 edition) contains a table of the Sun's parallax in
altitude - ranging from 9" at 0-deg to 0" at 90-deg. As stated by others,
the median parallax in altitude per this table is 6" at 50-deg. Should
there be any interest, I will gladly publish this table, although actual
calculation is rather simple.

On Mon, 20 Sep 2004 20:07:34 -0400 Fred Hebard  writes:
> I use the parallax of the sun in clearing lunar distance
> observations,
> and haven't done any for a while, until this evening (about 1.5-2.5
> minutes out).  It's usually 0.1' of arc.  Is it tabulated or
> mentioned
> in the Nautical Almanac?  I couldn't find any mention of an actual
> value.
>
> Thanks,
>
> Fred Hebard
>
> P.S.  We're coming up on another equinox.  I, for one, wouldn't mind
> another discussion of how it's determined.  I know it's old hat to
> proficient astronomers such as Herbert Prinz, Geo Huxtable, Frank
> Reed,
> etc, but for the rest of us...!
>

   

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