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A couple times over the years I have advocated a visual estimate of the
horizon as a simple way to practice inland with a marine sextant.

http://fer3.com/arc/m2.aspx/marine-sextant-on-land-Hirose-oct-2008-g6384

For hobbyists who want "the marine experience", this is more realistic
than an artificial horizon. The process of finding a star, bringing it
down, and swinging the sextant to attain the correct alignment is the
same as at sea.

Of course an artificial horizon is more accurate. But I only use my
sextant at home, for fun. In my experience, a liquid artificial horizon
turns fun into work. I have never tried the mirror type, but I'm sure it
would be maddening to fiddle with a level and screws on a cold evening
just to get a few star shots.

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