[time-nuts] Information on the Danjon Astrolab

Poul-Henning Kamp phk at phk.freebsd.dk
Tue Aug 8 04:33:32 EDT 2006


In message <20060808.102323.-861060158.cfmd at bredband.net>, Magnus Danielson wri
tes:

>> You would really need to know the direction of local gravity for
>> this to be any good...
>
>Down? :-)

There's a big difference between "down enough that cows don't easily
tip over" and "passes through the center of the earth".

I know the Carlsberg Meridian had to take it into account when
it was moved down to the Canary Islands.

>Wouln't a number of measurements and comparision with other methods and
>measurements help to reveal such deviations? Then again, question is if the
>deviation is so large that it has a real impact.

Obviously, it all depends how precise you want it.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.



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