polar axis

noun Mathematics.
the fixed line, usually horizontal, from which the angle made by the radius vector is measured in a polar coordinate system.

Origin:
1890–95

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World English Dictionary
polar axis
 
n
the fixed line in a system of polar coordinates from which the polar angle, θ, is measured anticlockwise

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Place the globe so that its polar axis is horizontal to the ground, and place a light source at the same height as the globe.
The elliptical orbit does not cause the seasons, the polar axis tilt does.
The polar axis conforms with the line of collimation of the solar telescope.
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