Which phenomenon contributes to positional errors when using large brass astrolabes under direct sunlight?

💡 Explanation

When astrolabes are exposed to sunlight, uneven thermal expansion of the brass components occurs because different parts absorb varying amounts of solar radiation, causing distortions and affecting the accuracy of angular measurements. Therefore thermal expansion results, rather than hysteresis, magnetic declination, or parallax, each arising from entirely different sources of error.

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