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Alex wrote:

> That's a potential important issue, but what is REALLY important is only
> that your sextant does not MOVE during the experiment.
> (Moving the sextant few milimeters on its place (table) destroys
> everything. Because of the parallax between the index and horizon mirror).
> Maybe the sextant has to be clamped somehow on the table, it is very hard
> to be sure it did not mopre a little when you rotate the drum.)

If you ARE attempting this at home without a tripod mount or clamp, by all
means run--don't walk--to your nearest hobby/crafts shop and pick up a
package of Plasticine (a non-drying modeling clay) to pound on the surface
and push your sextant legs into. It comes in small, cheap quantities--the
last I checked.  A couple of marble-sized chunks of beeswax could work as
well.

If you are a parent (or child) and there is a tub of play-dough under your
tree instead of an MP3-4 player or Gameboy, GPS etc., that could do too.
Will dry hard and keep the cat, kids, dog, or spouse from messing things up
(other than spittle and spaghetti sauce on the mirrors etc.). 

Bill

   

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