Indirect fire is shooting a projectile without relying on a direct line of sight between the gun and its target, in contrast to the case of direct fire. Aiming of indirect fire is instead performed by predicting a parabolic ballistic trajectory via calculation of the azimuth and inclination, and may include calibrating the aim by observer feedback about the actual point of impact of the preceding shot and thus readjusting to new firing angles for subsequent shots.
Indirect fire is shooting a projectile without relying on a direct line of sight between the gun and its target, in contrast to the case of direct fire. Aiming of indirect fire is instead performed by predicting a parabolic ballistic trajectory via calculation of the azimuth and inclination, and may include calibrating the aim by observer feedback about the actual point of impact of the preceding shot and thus readjusting to new firing angles for subsequent shots.
Source: Wikipedia "Indirect fire" · CC BY-SA 4.0
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