What is the name of the interior angle formed at the target by the intersection of the observer-target and gun-target lines?

The interior angle formed at the target by the intersection of the observer-target and gun-target lines is referred to as Angle T. This terminology is critical in field artillery operations, as it helps determine how to effectively adjust fire based on the positions of the observer and the gun.

Angle T is significant because it provides the necessary geometric relationship needed to calculate the proper azimuth and range for accurate targeting. It essentially represents the angle at which the observer must consider the positioning of both the target and the artillery piece, aiding in the alignment for striking the target effectively.

In contrast, terms like OT Factor, Vertex Angle, and Vertical Angle refer to different concepts or measurements that are not specific to the description of the angle formed at the target from these particular lines. Understanding the context and applications of Angle T contributes significantly to the precision required in artillery targeting.