What is a key characteristic of the artificial horizon instrument?

A key characteristic of the artificial horizon instrument is that it rotates around a vertical axis. The artificial horizon, also known as an attitude indicator, primarily displays the aircraft's pitch and roll relative to the horizon. This instrument uses gyroscopes to maintain its orientation, providing pilots with critical information about the aircraft's attitude, especially in conditions where the natural horizon is not visible.

The ability of the artificial horizon to rotate around a vertical axis is essential for accurately indicating the aircraft's position in three-dimensional space. This feature allows the indicator to reflect changes in the aircraft's orientation during maneuvers, which is crucial for maintaining safe and controlled flight.