an instrument used for taking the altitude of the sun or a star; = Jacob's staff, n. 2a; cf. radius, n. 2.
| 单词 | θ1431 |
| 释义 | the world > the universe > cosmology > science of observation > astronomical instruments > rising and setting > [noun] (3) astronomer's staff1551 an instrument used for taking the altitude of the sun or a star; = Jacob's staff, n. 2a; cf. radius, n. 2. almucantar staff1696 an instrument for ascertaining the altitude of the sun at its rising and setting and hence its amplitude. almucantar1880 A telescope mounted on a float resting in mercury in such a way that it can be turned in a horizontal plane while remaining at the same angle to the… |
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