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Or you can simply buy an artificial horizon for less than US$ 40: * https://www.davisinstruments.com/product/artificial-horizon/ https://www.davisinstruments.com/product/artificial-horizon/ * https://www.starpath.com/catalog/accessories/1840h.htm https://www.starpath.com/catalog/accessories/1840h.htm * https://www.celestaire.com/product/davis-artificial-horizon/ https://www.celestaire.com/product/davis-artificial-horizon/ They've been around since (at least) 1907: * https://www.scientificamerican.com/article/an-artificial-horizon-for-sextants/ https://www.scientificamerican.com/article/an-artificial-hor...