Which effect arises when an astrolabe's alidade is misaligned with its axis?

💡 Explanation

When the alidade is misaligned, parallax error arises because the observer’s line of sight is no longer perpendicular to the astrolabe’s plane, causing incorrect angular measurements. Therefore, inaccurate measurements result, rather than thermal errors, instability, or corrosion, which depend on other environmental and material factors.

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