Altitude diving — is scuba diving where the surface is 300 meters (1,000 feet) or more above sea level (for example, a mountain lake). [cite book |title=Encyclopedia of Recreational Diving, 3rd edition |last=Brylske |first=A. |year=2006 |publisher=PADI… … Wikipedia
correction Q — The correction applied to observed attitudes of Polaris to compensate for its displacement from the north celestial pole when obtaining latitudes by sextant. For example, in the Northern Hemisphere, the star Polaris (declination 89°10’N) is close … Aviation dictionary
Q-correction — That applied to the observed altitudes of the Polaris star. The value of this correction is given in the Air Almanac, and it is applied to the Polaris altitude to obtain the true latitude. In the Northern Hemisphere the star Polaris (Declination… … Aviation dictionary
refraction correction — noun (astronomy) The correction made in the calculation of the altitude of a star, planet, etc to allow for the refraction of its light by the earth s atmosphere • • • Main Entry: ↑refract … Useful english dictionary
refraction correction — /rəˈfrækʃən kərɛkʃən/ (say ruh frakshuhn kuhrekshuhn) noun the small correction which has to be made to the observed altitude of a celestial body due to the refraction by the earth s atmosphere of the light which it emits or reflects …
Mikoyan-Gurevich MiG-3 — MiG 3 Soviet Air Force MiG 3s in winter camouflage. The slogan on the nearest aircraft reads Za Rod … Wikipedia
Michael Marsh (athlete) — Michael Marsh Personal information Nationality American Born August 4, 1967 (1967 08 04) (age 44) Los Angeles … Wikipedia
Asafa Powell — after his 9.72 win at the 2010 Bislett Games. Personal information Nationality Jamaican Born 23 November 1982 ( … Wikipedia
Inertial measurement unit — An inertial measurement unit, or IMU, is the main component of inertial guidance systems used in air , space , and watercraft, including guided missiles. An IMU works by sensing motion including the type, rate, and direction of that motion using… … Wikipedia
Sundial — A sundial is a device that measures time by the position of the Sun. In common designs such as the horizontal sundial, the sun casts a shadow from its style (a thin rod or a sharp, straight edge) onto a flat surface marked with lines indicating… … Wikipedia
GRAVIMÉTRIE — La gravimétrie a pour objet la mesure de l’intensité de la pesanteur en un point donné, et elle exploite les résultats de cette mesure, effectuée en un grand nombre de stations. L’intensité de la pesanteur étant directement liée à l’attraction… … Encyclopédie Universelle