astronomer's staff
now historical
noun
An instrument used for taking the altitude of the sun or a star; = Jacob's staff.
Origin
Mid 16th century; earliest use found in Robert Record (c1512–1558), mathematician.
| 单词 | astronomer's staff |
| 释义 | astronomer's staffnow historical noun An instrument used for taking the altitude of the sun or a star; = Jacob's staff. Origin |
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