Page "learned" Paragraph 1417

In Fig. 7-4, the input axis of the three-axis platform is shown at some point on the earth.

The point is at a latitude **yl, and the platform is at an error in heading east.

The earth is spinning at an angular velocity **zq equal to one revolution per 24 hr..

When the platform is level, **ye is a rotation about the Z axis of the platform Af.

Since the earth is rotating and the unleveled gyro-stabilized platform is fixed with respect to a reference in space, an observer on the earth will see the platform rotating ( with respect to the earth ).