| 单词 | position line |
| 释义 | > as lemmasposition line position line n. a line on which the observer is computed to be after having taken a bearing. ΘΚΠ the world > space > place > position or situation > [noun] > ascertaining or determining position of anything > line of position position line1777 line of position1865 1777 R. Waddington Epitome Theoret. & Pract. Navigation xii. 52 From D, draw the lines DA, DB, to cut the position lines, as at A and B, which are the places of the capes. 1863 W. Chauvenet Man. Spherical & Pract. Astron. I. viii. 428 Let the first observation give the position line AA′ (Fig. 35), and let Aa represent, in direction and length, the ship's course and distance sailed between the observations. 1920 J. E. Dumbleton Princ. & Pract. Aerial Navigation i. 13 Owing to small errors three position lines will rarely intersect at a point, but a small triangle is formed known as a ‘cocked hat’. 1991 Motorboat & Yachting June 60/4 As there's only one place which can be on both these position lines at once, that must be where we are. < as lemmas |
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