sighting axis

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• 1986 São Paulo UFO sighting — As many as twenty UFOs were seen and tracked by ground radar and at least six airplanes during the night of May 19, 1986 over several states in southeastern Brazil. Unidentified radar returns were tracked by airports in São Paulo and the… …   Wikipedia

• Beijing city fortifications — The city wall of Beijing was a fortification built around 1435. It was 23.5 km long. The thickness at ground level was 20m and the top 12m. The wall was 15m high, and it had nine gates. This wall stood for nearly 530 years, but in 1965 it was… …   Wikipedia

• Bullet drop — is the name given to the tendency of a bullet to drop in flight due to the effect of gravity. It is important to understand the ballistics of a given cartridge when zeroing the weapon. For example, Hornady lists a bullet drop of 42.40 in (1.076… …   Wikipedia

• Course Setting Bomb Sight — The CSBS Mk. IX mounted in a Fairey Battle. The bomb aimer is sighting through the white ring shaped backsights to the pin shaped foresights (just visible against the armoured cable) and holding the bomb release switch in his right hand. The… …   Wikipedia

• Compass — This article is about the direction finding instrument used in navigation. For other uses, see Compass (disambiguation). A simple dry magnetic pocket compass …   Wikipedia

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• Battle of the Coral Sea — Part of the Pacific Theater of World War II …   Wikipedia

• Mark XIV bomb sight — The Mk. XIVA sighting head, which would be mounted in the front of the aircraft and connected to the computor by the cables coiled up on the left. The main features are the gyrostabilizer in the large cylinder, and the collimator on the moving… …   Wikipedia

• AIM-9 Sidewinder — Infobox Weapon is missile=yes name=AIM 9 Sidewinder caption= origin= United States type=Short range air to air missile used by= manufacturer=Nammo Raytheon Company Ford Aerospace Loral Corp. unit cost=US$85,000 propellant= production… …   Wikipedia

• Armillary sphere — An armillary sphere (variations are known as spherical astrolabe, armilla, or armil) is a model of the celestial sphere. Description and use of the armillary sphere The exterior parts of this machine are a compages of brass rings, which represent …   Wikipedia

• Ship gun fire-control system — Mk 37 Director c1944 with Mk 12 (rectangular antenna) and Mk 22 orange peel Ship gun fire control systems (GFCS) enable remote and automatic targeting of guns against ships, aircraft, and shore targets, with or without the aid of radar or optical …   Wikipedia