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magnetic variation

British  

noun

  1. another name for magnetic declination

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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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

Hailey’s isogonic map of magnetic variation, published in 1701.

From "The Invention of Science" by David Wootton

Latitude, 6° 4' 45" south; longitude, 75° 1' west of Greenwich; magnetic variation, 7° 22' 10" east; thermometer, 79°; elevation above sea-level, 377 feet; distance from the Atlantic, 2482 miles; current, 3 miles per hour.

From Life of Rear Admiral John Randolph Tucker by Rochelle, James Henry

They crossed the line of no magnetic variation, and when the needle of the compass began to change its usual direction, they were sure it was bewitched.

From A Brief History of the United States by McMaster, John Bach