also: アストロラーブ
noun
astrolabe
An ancient astronomical instrument used for measuring the altitude of celestial bodies and solving problems related to time and the position of the stars. Technical term in astronomy and history of science.
中世の天文学者はアストロラーベを使って星の位置を測定した。
Medieval astronomers used the astrolabe to measure the positions of stars.
Borrowed from English 'astrolabe', ultimately from Greek 'astrolabos' (star-taker).