[time-nuts] Information on the Danjon Astrolab
Poul-Henning Kamp
phk at phk.freebsd.dk
Tue Aug 8 08:33:32 UTC 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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