Which effect arises when an astrolabe's altitude scale is warped due to uneven thermal expansion across its surface?

💡 Explanation

When an astrolabe warps from heat, geometric inaccuracy in the altitude scale affects angle readings creating systematic error in calculating local time from star altititude because of errors inherent in that particular instance of use. Therefore, the time measurements would become systematically wrong, rather than star positions which are independant or effects of planetary calculation or shadow distortion with other simpler causes.

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