axis
an imaginary line that passes through Earth’s center and its North and South poles
The axis, in science and mathematics, refers to an imaginary straight line that cuts through the center of a body or an object around which it rotates or revolves. The axis is used to describe the orientation or position of the body or object in space. In most cases, the axis is perpendicular to the plane of rotation or revolution.
For example, the Earth rotates around its axis, which is an imaginary straight line that extends from the North Pole to the South Pole. The axis of the Earth is tilted at an angle of about 23.5 degrees to the plane of its orbit around the Sun. This tilt is responsible for the change of seasons we experience on Earth.
Another example is in mathematics, where the axis is used to plot points on a graph. A graph has two axes: the horizontal x-axis, and the vertical y-axis. The point where the two axes intersect is called the origin, and it is always zero.
In summary, the axis is an important concept in science and mathematics and is used to describe the orientation or position of a body or object in space.
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