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Which limitation affected the accuracy of early hand-crafted brass astrolabes when determining the altitude of celestial objects?

A)Material thermal expansion during daytime
B)Inaccurate angular graduations on the rim
C)Magnetic interference with alignment
D)Parallax error from nearby structures

💡 Explanation

When an astrolabe's angular graduations are imprecise, systematic errors arise in altitude measurements because the instrument provides a flawed celestial coordinate system. Therefore angular inaccuracy is the problem, rather than expansion, magnetic interference, or parallax which would be environmental or user-introduced errors.

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