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Doesn't a sextant also require a rather thick book listing the positions of many celestial bodies at certain times/locations?
by mellavora 4y ago
Doesn't a sextant also require a rather thick book listing the positions of many celestial bodies at certain times/locations?
- adrian_b 4y agoOnly if you use it to measure the angular height of stars during the night. When you use it for the Sun at the local noon, as in traditional navigation, you only need a chronometer that keeps the time from some place of known longitude, and nothing else.