Which systematic error arises when an astrolabe's alidade exhibits play around its central pivot during angular measurements?

💡 Explanation

Backlash occurs due to free movement; therefore, imprecise angular values are read, because the alidade rotates somewhat independently. Static imbalance would require sustained motion, rather than a single measurement; parallax involves viewing angled from different linear positions; therefore the answer is backlash, rather than the other mechanisms.

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