しょうげんぎ
象限儀
1. quadrant (instrument)
2. Quadrant (instrument)A quadrant is an instrument that is used to measure angles up to 90°. It was originally proposed by Ptolemy as a better kind of astrolabe. Several different variations of the instrument were later produced by medieval Muslim astronomers.
Read “Quadrant (instrument)” on English Wikipedia
Read “象限儀” on Japanese Wikipedia
Read “Quadrant (instrument)” on DBpedia
Read “Quadrant (instrument)” on English Wikipedia
Read “象限儀” on Japanese Wikipedia
Read “Quadrant (instrument)” on DBpedia
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