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double drift

noun

, Navigation.
  1. a method of calculating wind direction and velocity by observing the direction of drift of an aircraft on two or more headings.


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Example Sentences

Only two places where they can ford it—Double Drift and Cornetjies Drift, one hour's walk apart.

Taking about eleven hundred stars whose proper motions have been ascertained with an approach to certainty, and which are distributed in all parts of the sky, it has been shown that there exists an apparent double drift, in two independent streams, moving in different and nearly opposed directions.

The fact that the little star Alcor placed so close to Mizar should accompany the latter in its flight is not surprising, but that two of the principal stars of the group should be found moving in a direction directly opposed to that pursued by the other five is surprising in the highest degree; and it recalls the strange theory of a double drift affecting all the stars, to which attention was called in the preceding chapter.

They seemed like a double drift of stars, streaming through space.

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