Section I.3 - Observed Altitude

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Why is it less than ideal to use a celestial body that is within 10 degrees of the horizon?

SI.3 Q1

Actually, it isn’t less than ideal - you will get accurate measurements and need no further corrections.

Because there are often clouds that obstruct the view thus the measurement is inaccurate.

Because there is turbulence in the atmosphere that bends the light oddly thus requiring additional corrections for an accurate measurement.

Because it gets too hard to see the horizon in the sextant thus requiring additional corrections for an accurate measurement.

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