Quote:
Originally Posted by h0ughy
.... Since then we have had about 200mm rainfall, and hence the ground has moved again.
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Houghy,
In my backyard at least, it seems to be unavoidable.
My yard is the worst type of clay....I had to dig a pool through it!
I have a laser permanently mounted to my GEM base and it shines on
to an X on the wall of the house.
The island slab that my GEM sits on seems to move in a wet/dry season
cycle. This shows on the drift with the laser.
Fortunately, I have fine Azimuth and altitude adjustment of the GEM
tripod and a night of Drift Explorer in K3CCDTools has this fixed.
If you think any slab, at least the slab a typical backyarder lays,
is not going to move some amount, you are kidding yourself.
Steve