magnetic variation
Britishnoun
Example Sentences
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Hailey’s isogonic map of magnetic variation, published in 1701.
From "The Invention of Science" by David Wootton
Hailey had conducted two expeditions to make the measurements on which the map was based, and the hope was that this would open the way to using magnetic variation to measure longitude.
From "The Invention of Science" by David Wootton
Each line on the map is like a contour line but, instead of marking a uniform measurement of height, it marks a uniform measurement of magnetic variation.
From "The Invention of Science" by David Wootton
By an azimuth of the sun's centre taken this morning, the magnetic variation was observed to be about 20 minutes west.
From Journals of Australian Explorations by Augustus Charles Gregory
By this alone, within three hours on each side of noon, the longitude, latitude, and magnetic variation of a position may be determined.
From The Sailor's Word-Book An Alphabetical Digest of Nautical Terms, including Some More Especially Military and Scientific, but Useful to Seamen; as well as Archaisms of Early Voyagers, etc. by Sir Edward Belcher
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