Which angular measurement error would result if al-Biruni's astronomers incorrectly leveled an astrolabe during solar altitude observations?

💡 Explanation

When the astrolabe is not perfectly level, the vertical axis is tilted, causing systematic error because all zenith distance measurements will be skewed relative to the true zenith. Therefore a systematic error results, rather than random azimuth errors, parallax, or aberration which do not arise from level misalignment .

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