# polar axis

noun, Mathematics
1.
the fixed line, usually horizontal, from which the angle made by the radius vector is measured in a polar coordinate system.
Origin of polar axis
1890-1895
1890-95
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for polar axis
Historical Examples
• On to the upper part of the polar axis is fastened the declination circle, C, 5½ in.

• The polar axis of the earth may be defined as the diameter about which the earth rotates.

Robert Stawell Ball
• That the earth revolves round the sun, and rotates on its polar axis, have long been the settled canons of our system.

• Certain of these changes have recently been explained by the discovery of a new and hitherto unnoted movement of the polar axis.

Nathaniel Southgate Shaler
• A slow motion adjustment independent of the clock is fitted to the polar axis.

Wm. Gaertner & Co.
• The diameter of the earth in latitude 30° is really about 20 miles longer than the polar axis.

James Y. Simpson
• If the polar axis is set vertical and the worm wheel unclamped, the instrument is transformed into an alt-azimuth mounting.

Wm. Gaertner & Co.
• Perhaps the globe would deviate from her course; perhaps an alteration in her polar axis would take place.

Anonymous
• Mercurial bearings counterbalance the weight of the polar axis in large part.

David Todd
• Thus the wide habitability of the earth is an effect arising from the inclination of its polar axis.

Nathaniel Southgate Shaler
British Dictionary definitions for polar axis

## polar axis

noun
1.
the fixed line in a system of polar coordinates from which the polar angle, θ, is measured anticlockwise
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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### Difficulty index for polar axis

Few English speakers likely know this word

### Word Value for polar

7
9
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