Gunnery is the skill and science of operating large guns, especially the heavy artillery and cannons used on warships, tanks, or fortifications. A gunnery officer on a naval vessel must master complex mathematics to calculate exactly where to aim, accounting for the ship's movement, the wind, the curve of the Earth, and the distance to the target. Hitting a target miles away from a rolling ship requires precision that seems almost impossible.

Historical sailing warships had specialized gunnery crews who spent years perfecting their craft. They had to work together perfectly, loading massive cannons, aiming them through small portholes, and firing at just the right moment as their ship pitched and rolled on the waves.

Today, gunnery still requires intense training. Tank crews practice gunnery drills to hit targets while moving across rough terrain. Modern gunnery combines traditional skills with computers and advanced technology, but the core challenge remains: putting a projectile exactly where you intend it to go, even under difficult conditions. The term can also refer to the specific techniques and knowledge involved, as in a gunnery manual or gunnery school.