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axis
- An imaginary straight line through a celestial body, around which it rotates.
- One of three lines of reference around which a spacecraft can rotate. These lines are the longitudinal (front-to-back), horizontal, and vertical axes. Rotation along them is known as roll, pitch, and yaw, respectively.
- A line with respect to which a curve or figure is drawn, measured, rotated, etc. The word comes from the Greek root aks for a point of turning or rotation and seems to have first been used in English by Thomas Digges around 1570 in reference to the rotational axis of a right circular cone.
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• MATHEMATICS
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