03-29-2016, 01:26 AM
(03-27-2016, 09:16 PM)bletso Wrote: Get a 1st surface mirror, no ripples, no freezing, (well except for you). Remember to level it. $20 for a 6 X 6 1/4 thick glass unit from www.firstsurfacemirror.com It is more accurate to measure limb on limb. Try UL in morning letting the sun rise up to the AH reflection and subtract semi-diameter. In the PM LL let the sun fall into the AH reflection and add semi-diameter.
bletso,
The problem is the cost of the levels. They are expensive for precision ground vial levels (depending upon sensitivity). I have no idea what sensitivity should be purchased. Maybe 10 seconds? Two would be needed for easier levelling. I've seen a Plath AH.
https://www.leveldevelopments.com/produc...und-vials/
Any ideas?
Louis