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The United States Armed Forces authorize certain medal and ribbon devices that may be worn if authorized on a defined set of United States military decorations and awards. [1] The devices vary between 3 ⁄ 16 inch to 13 ⁄ 32 inch in size and are usually attached to suspension and service ribbons of medals and to unit award ribbons.
Oak leaf clusters are worn with the stems of the leaves pointing to the wearer's right. For medals, 13 ⁄ 32-inch (10 mm) oak leaf clusters are worn on the medal's suspension ribbon. [4] For service ribbons, 5 ⁄ 16-inch (7.9 mm) oak leaf clusters are worn, with no more than four oak leaf clusters being worn side by side.
The turnoff point for a star refers to the point on the Hertzsprung–Russell diagram where it leaves the main sequence after its main fuel is exhausted – the main sequence turnoff. By plotting the turnoff points of individual stars in a star cluster one can estimate the cluster's age .
During the Korean War and the Vietnam War, US ground forces used the M127A1 White Star Signal Flare Parachute to illuminate the jungle in forward positions. A modern LUU-2B flare at 1,000 feet altitude illuminates the ground at 5 lux in a radius of 1500 feet. Burn time is 4–5 minutes.
The United States Army Signal Corps (USASC) is a branch of the United States Army that creates and manages communications and information systems for the command and control of combined arms forces. Established in 1860 by Major Albert J. Myer , it had a major role in the American Civil War .
Abel (globular star clusters) Abell — Abell catalogue; Abetti — Giorgio Abetti (double stars) Abt — (for example: open star cluster Abt 1 = Biurakan 4 = Markarian 6 = Stock 7) (at 2:29.6 / +60°39' near the southwestern section of the Heart Nebula in Cassiopeia) AC — Astrographic Catalogue; A.C. — Alvan Clark (double stars)
The regions with higher density of stars are shown; these correspond with known star clusters (Hyades and Coma Berenices) and moving groups. This is a list of nearby stellar associations and moving groups. A stellar association is a very loose star cluster, looser than an open cluster. A moving group is the remnant of such a stellar association ...
The Melotte catalogue is a catalogue of 245 star clusters compiled by British astronomer Philibert Jacques Melotte. It was published in 1915 as A Catalogue of Star Clusters shown on Franklin-Adams Chart Plates. [1] Catalogue objects are denoted by Melotte, e.g. "Melotte 20". Dated prefixes include as Mel + catalogue number, e.g. "Mel 20". [2]