| 释义 |
nonagesimal, a. and n. Astr.|nɒnəˈdʒɛsɪməl|
[f. L. nōnāgēsim-us, ordinal of nōnāginta ninety: see -al1. Cf. F. nonagésimal.]
A. adj. nonagesimal degree, nonagesimal point: that point of the ecliptic which is highest above the horizon at any given time, being 90° above the point at which the ecliptic intersects the horizon.
1704J. Harris Lex. Techn. I, Nonagessimal Degree, is the highest Point, or 90th Degree of the Ecliptick. 1797Encycl. Brit. (ed. 3) II. 522/2 Sometimes she stands, as it were, upright on her lower horn, and then such a line [sc. touching the points of the moon's horns] is perpendicular to the horizon: when this happens she is in what the astronomers call the nonagesimal degree. 1833Herschel Astron. iv. 182 The altitude of its highest point or as it is sometimes called, the nonagesimal point of the ecliptic. 1862G. C. Lewis Astron. Ancients iv. §1 The angle of the east, which is now called the nonagesimal degree.
B. n. The nonagesimal degree.
1789Phil. Trans. LXXIX. 59, I have calculated them two different ways, viz. by the method of parallactic angles, and by the method of the nonagesimal. 1815Burney Falconer's Marine Dict. s.v., The altitude of the nonagesimal is equal to the angle of the east, and, if continued, passes through the poles of the ecliptic. 1834Nat. Philos. III. Astron. (Libr. Usef. Knowl.) xii. 252/1 What we have here called the longitude of the zenith, is often called the longitude of the nonagesimal. |