# polar axis

The term "polar axis" is used in fields like astronomy, mathematics, and physics to describe a reference line or axis important for measuring angles, directions, and rotations.

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## Definition

### B2Astronomy

(technical)The imaginary line extending through a celestial body's poles, around which the body rotates.

#### Example

- The Earth rotates around its polar axis, resulting in day and night.

### B2Mathematics

(technical)A fixed reference line in polar coordinates from which angles are measured, typically corresponding to the positive x-axis in Cartesian coordinates.

#### Example

- In polar coordinates, the angle is measured from the polar axis.

### B2Physics

(technical)A reference line used to describe the rotation or symmetry of objects.

#### Example

- The gyroscope spins around its polar axis.

## Similar

Terms that have similar or relatively close meanings to "polar axis":

major axisaxis of rotationpolar coordinatesnorth poleaxial pointpole staroptic axismagnetic poleaxis of upheavaltrue north