An instrument formerly used for taking the altitude of the sun; a cross-staff.
| 单词 | θ1409 |
| 释义 | the world > the universe > cosmology > science of observation > astronomical instruments > measuring altitude > [noun] > cross-staff (8) Jacob's staff1559 An instrument formerly used for taking the altitude of the sun; a cross-staff. cross-staff1594 An instrument formerly used for taking the altitude of the sun or a star. Obsolete. fore-staff1669 = cross-staff, n. 2 (see quot. 1867). radius1745 Chiefly Astronomy and Nautical. An instrument formerly used for taking the altitude of the sun or a star; = cross-staff, n. 2a, Jacob's staff, n.… jackstaff1886 U.S. An instrument used in navigation to measure the angles between distant and celestial objects, consisting of a graduated staff equipped with one… Subcategories:— limb of (3) |
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