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Which limitation constrained ancient mariners using an astrolabe?

A)Determining longitude accurately at sea
B)Measuring the obliquity of the ecliptic
C)Calculating planetary positions reliably
D)Predicting lunar phases precisely daily

💡 Explanation

Astrolabes primarily assisted in measuring latitude; longitude estimation required accurate timekeeping, creating challenging. Dead reckoning was a factor, because positional errors accumulated over distance rather than instantaneous measurements made estimating longitude accurately at sea more difficult.

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