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单词 helispherical
释义 helispherical, a.|hɛlɪˈsfɛrɪkəl|
[irreg. f. helix + spherical.]
Winding spirally upon a sphere.
helispherical line: the line traced upon the terrestrial sphere by a ship sailing constantly towards the same point of the compass (other than the four cardinal points), which winds spirally round the pole, continually approaching but never reaching it; otherwise called the loxodromic curve or rhumb-line.
a1646J. Gregory Posthum. (1650) 285 (T.) They are helispherical lines, as they call them.1659Moxon Tutor Astron. i. (1686) 9 The Rhumbs are neither circles nor streight Lines, but Helispherical or Spiral lines.1796Hutton Math. Dict., Helispherical line is the Rhumb line in Navigation.
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