Which outcome results from misalignment of the alidade on an astrolabe when measuring the altitude of a star?

💡 Explanation

When the alidade is misaligned, parallax error is introduced because the observed angle is shifted from the true altitude, leading to a systematic bias in all altitude measurements. Therefore a systematic error in the altitude reading results, rather than projection errors, inaccurate meridian alignment, or ecliptic coordinate distortion, which depend on different aspects of the instrument's construction and use.

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