Which mechanism limits accuracy when using an astrolabe to determine sunset time during the equinox?

💡 Explanation

When determining sunset time with an astrolabe, atmospheric refraction bends the light from sun near horizon, causing a perceived elevation higher than actual angular height, affecting its measured position. Therefore atmospheric refraction limits the accuracy, rather than parallax error, alidade errors or azimuth conversion, which have different mechanisms and impacts.

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• Which structural failure increases in timber-framed windmills when grain dust accumulates excessively inside the mill housing?
• Which optical outcome arose in Alhazen's pinhole experiments when the aperture size increased beyond the diffraction limit?
• Which structural problem arises in a medieval stone arch bridge if the keystone is removed?
• Which outcome resulted from repeated heating and hammering during bronze casting during the Mesopotamian Bronze Age?