What is ALGOL?

  • (noun): Second brightest star in Perseus; first known eclipsing binary.
    See also — Additional definitions below


Algol (Beta Per, β Persei, β Per), known colloquially as the Demon Star, is a bright star in the constellation Perseus. It is one of the best known eclipsing binaries, the first such star to be discovered, and also one of the first (non-nova) variable stars to be discovered. Algol is actually a three-star system (Beta Persei A, B, and C) in which the large and bright primary Beta Persei A is regularly eclipsed by the dimmer Beta Persei B. Thus, Algol's magnitude is usually near-constant at 2.1, but regularly dips to 3.4 every two days, 20 hours and 49 minutes during the roughly 10-hour long partial eclipses. There is also a secondary eclipse when the brighter star occults the fainter secondary. This secondary eclipse can only be detected photoelectrically. Algol gives its name to its class of eclipsing variable, known as Algol variables.

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Some articles on ALGOL:

Caravans To Empire Algol
... Caravans To Empire Algol is the first album by the ambient project Neptune Towers ... Fenriz considers this to be the first of the two chapters of the "Empire Algol" saga, the second (and final) being the next Neptune Towers album, "Transmissions From Empire Algol" ...
Lists Of Computer Languages - A
... A#.NET A# (Axiom) A-0 System A+ A++ ABAP ABC ABC ALGOL ABLE ABSET ABSYS Abundance ACC Accent Ace DASL ACT-III Action! ActionScript Ada Adenine Agda ...
Algol - Cultural Significance
... See also Algol in astrology The constellation Perseus and Algol, the Bright Star in the Gorgon's head Johannes Hevelius, Uranographia, 1690 In the ... Astrologically, Algol is considered one of the unluckiest stars in the sky, and was listed as one of the 15 Behenian stars ...
Bendix G-20 - G-21 System
... The machine was programmed in a dialect of ALGOL-60 called ALGOL-20 ... Deviations from Algol-60 included the lack of support for recursion, extensions to imbed G-20 machine language within ALGOL - WHAT, and a CIT developed printer formating language ...
Charles H. Lindsey
... most known for his involvement with the programming language Algol 68 ... He was an editor of the Revised Report on Algol 68, and co-wrote a ground breaking book on the language An Informal Introduction to Algol 68 ISBN 0-7204-0726-5, which was unusual because ... He was responsible for the research implementation of Algol 68 for the experimental MU5 computer at Manchester University, and still maintains an implementation of a subset ...

More definitions of "ALGOL":

  • (noun): ALGOrithmic Language; a programming language used to express computer programs as algorithms.