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← HistoryWhich 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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