X-axis
axis of abscissas

"Can you hit the positive X axis just one shot?"

It's a point on the X axis of a graph.

And the one that's part of the calculation goes along the X axis okay.

We're going to have, difference along the X axis will be nought point two.

Suppose many points are close to the "x" axis and distributed along it.

To take an image, the sensor travels the x axis, taking one exposure per point.

The X axis is positive in the direction of the flight azimuth.

Consider a one-dimensional space; there is only one degree of freedom: the x axis.

This represents a wave polarized at an angle with respect to the x axis.

Distance a locates the focus of the parabola on the x axis.