How is time determined at night using the astrolabe?
Answer
By aligning a known star's pointer on the rete with its measured altitude on the mater, then rotating the rete to align the time line with the horizon lines on the tympan
Nighttime determination involves aligning the pointer of the observed star (on the rete) with its measured altitude on the mater, and subsequently rotating the rete until the current time line matches the horizon lines engraved on the tympan.
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