Friends (season 6)

The sixth season of Friends, an American sitcom created by David Crane and Marta Kauffman, premiered on NBC on September 23, 1999. Friends was produced by Bright/Kauffman/Crane Productions, in association with Warner Bros. Television. The season contains 25 episodes and concluded airing on May 18, 2000.

Season synopsis

In the season premiere ("The One After Vegas"), Ross and Rachel's marriage is established to be a drunken mistake, and although Ross lies and says he got the marriage annulled so that he won't have to be known as the "three divorces" guy, Rachel eventually finds out and they divorce several episodes later. Monica and Chandler decide to move into her apartment together, and Rachel moves in with Phoebe. Joey lands a role on a cable television series called Mac and C.H.E.E.S.E, where he stars alongside a robot. Ross gets a job lecturing at New York University, and starts dating one of his students, Elizabeth (Alexandra Holden). Phoebe and Rachel's apartment catches fire, and Rachel moves in with Joey while Phoebe moves in with Chandler and Monica. In the season finale, Chandler proposes to Monica.

Overwatch

In modern warfare, overwatch is a force protection tactic: the state of one small unit or military vehicle supporting another unit, while they are executing fire and movement tactics. An overwatching, or supporting unit has taken a position where it can observe the terrain ahead, especially likely enemy positions. This allows it to provide effective covering fire for advancing friendly units. The term overwatch originates in U.S. military doctrine (derived from the common expression watch over).

An ideal overwatch position provides cover for the unit, and unobstructed lines of fire. It may be on a height of ground or at the top of a ridge, where a vehicle may be able to adopt a hull-down position. If the overwatching unit is in a position to fire over advancing friendly units, great care must be taken not to let fire fall short. The friendly units should be within tracer burnout (the range at which tracer rounds are visible).

Overwatch can be performed by platoons during company fire and movement, by individual armoured fighting vehicles (especially tanks) or infantry sections, in platoon fire and movement, or even by fireteams or individual soldiers, in the final stages of an assault.

Season

A season is a division of the year, marked by changes in weather, ecology and hours of daylight. Seasons result from the yearly orbit of the Earth around the Sun and the tilt of the Earth's rotational axis relative to the plane of the orbit. In temperate and polar regions, the seasons are marked by changes in the intensity of sunlight that reaches the Earth's surface, variations of which may cause animals to go into hibernation or to migrate, and plants to be dormant.

During May, June, and July, the northern hemisphere is exposed to more direct sunlight because the hemisphere faces the sun. The same is true of the southern hemisphere in November, December, and January. It is the tilt of the Earth that causes the Sun to be higher in the sky during the summer months which increases the solar flux. However, due to seasonal lag, June, July, and August are the hottest months in the northern hemisphere and December, January, and February are the hottest months in the southern hemisphere.

Static pressure

In fluid mechanics the term static pressure has several uses:

Static pressure in design and operation of aircraft

An aircraft’s altimeter is operated by the static pressure system. An aircraft’s airspeed indicator is operated by the static pressure system and the pitot pressure system.

The static pressure system is open to the exterior of the aircraft to sense the pressure of the atmosphere at the altitude at which the aircraft is flying. This small opening is called the static port. In flight the air pressure is slightly different at different positions around the exterior of the aircraft. The aircraft designer must select the position of the static port carefully. There is no position on the exterior of an aircraft at which the air pressure, for all angles of attack, is identical to the atmospheric pressure at the altitude at which the aircraft is flying. The difference in pressure causes a small error in the altitude indicated on the altimeter, and the airspeed indicated on the airspeed indicator. This error in indicated altitude and airspeed is called position error.