The scientific concepts this work draws on.
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Rafal cites Aristotle to prove the Earth is at the center in Orb. We explain Aristotelian physics and its link to geocentrism.
Rafal grasps it by stumbling in Orb: if I am the one moving, the still scenery seems to move. We explain the relativity of motion.
The stars are already engraved on the astrolabe, so why sight one? The instrument is a calculator that derives the time, your orientation and your latitude.