Quote:
Originally Posted by Pilot_76
Speaking of Stellarium a realistic way of simulating a sextant sight in there would be getting the apparent alt. instead of geometric when you click on any celestial body correct? If I'd like to have more errors as in real life would it be more realistic by using the angle tool and measuring myself?
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That's what ETsd4 means when he says "which emulates the real refraction of stars and planets." It is the lens-like refraction of the light from astronomical bodies that shifts their positions, varying mostly by altitude above the horizon, but also in a lesser way by temperature and atmospheric pressure. In practice, you only need to consider the effect of altitude because positional shifts caused by the other two are smaller than the variations in your ability to measure.