| 单词 |
ex-meridian |
| 释义 |
ex-meridian, a. Navigation.|ɛksməˈrɪdɪən|
[f. L. ex outside + meridian.]
Of an observation of the sun or other heavenly body: not taken on the meridian, but sufficiently close to it to be reducible to a meridian altitude. Also, of, pertaining to, or calculated from such an observation.
1849J. T. Towson Tables Reduct. Ex-Meridian Altitudes 3 Where cloudy weather prevails, the reduction of ex-meridian observations, for the determination of the latitude, is only second in importance to the observed meridian altitude. 1881S. T. S. Lecky ‘Wrinkles’ in Pract. Navig. iv. 147 If the sun's meridian altitude be about 80°, the time from noon of an Ex-meridian observation should be less than ten minutes. 1904J. Gill Text-bk. Navig. (new ed.) xiv. 145 On account of the proximity of the Pole Star to the North Pole..it is..a very suitable object for determining latitude by ex-meridian method at any time when visible. 1953C. H. Cotter Elem. Navig. xxxvi. 397 The ex-meridian tables in Norie seem to be the most popular with officers of the Merchant Navy. 1961C. H. McDowell Dict. Math. (new ed.) 48 Ex-meridian altitude, observations of the sun a few minutes before or after noon (when the sun is obscured at noon). |
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