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← HistoryWhich consequence would diminishing lunar parallax have caused during early Islamic astronomical observation?
A)Inability to accurately measure stellar magnitude
B)Errors in determining the start of Ramadan
C)Underestimation of Earth's circumference's value✓
D)Reduced accuracy determining planetary epicycles
💡 Explanation
Underestimating Earth's size would occur, because lunar parallax measurement fundamentally depended on a baseline related to this unknown distance. Measurements depended on triangulation; therefore a smaller calculated parallax due to larger Earth-Moon distance yields smaller derived Earth size, rather than other observational errors.
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