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Topic: ALGOL

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In the News (Tue 16 Jul 19)

  ALGOL - Wikipedia, the free encyclopedia
ALGOL (short for ALGOrithmic Language) is a family of imperative computer programming languages originally developed in the mid 1950s which became the de facto standard way to report algorithms in print for almost the next 30 years.
ALGOL 60 allowed for two types of parameter passing: the common call-by-value, and the unique call-by-name, which has never again been adopted by any of its successor languages.
ALGOL 68 was defined using a two-level grammar formalism invented by Adriaan van Wijngaarden and which bears his name.
en.wikipedia.org /wiki/ALGOL   (938 words)

 eSky: Algol
The Arabs gave the name 'Algol' ('The Demon') to this blue dwarf star, almost certainly because it is one of the most variable stars in the sky.
As Algol's yellow primary star is circled by its companion, the less massive blue star loses streamers of matter from its surface.
Algol, the 'Demon' star, and its three attendants in the constellation of Perseus.
www.glyphweb.com /esky/stars/algol.html   (277 words)

 AAVSO: Algol, January 1999 Variable Star Of The Month
Algol is an eclipsing binary star system 93 light-years away as determined by the Hipparcos satellite.
Homer wrote of Algol in the Iliad: "...the Gorgon's head, a ghastly sight, deformed and dreadful, and a sight of woe".
Algol varies in V magnitude from 2.1 at maximum to 3.4 at primary minimum, with a period of 2.867315 days; this period, however, is slowly lengthening.
www.aavso.org /vstar/vsotm/0199.stm   (964 words)

Algol changes its brightness, because it is an eclipsing binary - every 68 hours and 49 minutes the demon "blinks" for roughly 8 hours as the dimmer star of the pair passes between the brighter star and the earth.
Algol is the most famous of the eclipsing variables and the only one known of in ancient times.
Medusa (Algol), whose head Perseus is carrying under his left arm, was the youngest and most beautiful and she was also the only mortal one of the three.
www.winshop.com.au /annew/Algol.html   (892 words)

But Algol is equally famed for the "Algol paradox." The higher the mass of a star, the shorter its lifetime, as its fuel is used so much faster.
Matter then flows in from the large one (at a rate of around two hundred- millionths of a solar mass per year) to the small bright one, the effect directly observed through the stellar spectrum as the K giant is being stripped nearly to its core.
Algol is no demon at all, but a true friend, teaching us how stars interact and die, the effects of which you can see from your own backyard with no telescope at all.
www.astro.uiuc.edu /~kaler/sow/algol.html   (881 words)

The USS Algol (AKA-54) was launched by the Moore Dry Dock Co., of Oakland, California, on February 17, 1943, for the maritime commission and christened as the James Baines.
On June 11, 1991, the Algol was towed from the James River Fleet to Willmington, North Carolina, where she was prepared by Eagle Island Marine to be sunk as a reef.
The Algol's towers, and funnel were burned off so her relief on the ocean floor would not cause a hazard to navigation.
www.bluewaterdivers.com /Sites/algol.htm   (963 words)

 New Jersey Scuba Diver - Artificial Reefs - USS Algol   (Site not responding. Last check: 2007-11-07)
Algol arrived in Tsingtao China, early in November, unloaded her cargo, and departed that port at the end of the third week in November.
Algol spent the remaining seven years of her Navy career operating primarily along the east coast of the United States and in the West Indies.
Algol was decommissioned on 23 July 1970 and was transferred to the Maritime Administration's National Defense Reserve Fleet at James River, Va. Her name was struck from the Navy list on 1 January 1977.
www.njscuba.net /reefs/site_uss_algol.html   (5025 words)

Algol (β Per / β Persei / Beta Persei) is a bright star in the constellation Perseus.
To be more precise, however, Algol happens to be a triple star system: the eclipsing binary pair is separated by only 0.062 AU, while the third star (Algol C) is at an average distance of 2.69 AU from the pair and the mutual orbital period is 681 days (1.86 years).
Algol is 92.8 light years from Earth, however about 7.3 million years ago it passed within 9.8 light years.
en.efactory.pl /ALGOL   (438 words)

 Algol 68 Genie - An Algol 68 interpreter   (Site not responding. Last check: 2007-11-07)
Algol 68 was defined in a formal document, first published in January 1969, and later published in Acta Informatica and also printed in Sigplan Notices.
Algol 68 was the first major language for which a full formal definition was made before it was implemented.
Another factor that hindered Algol 68 from spreading more widely is that Algol 68 was designed for programmers, not for compiler writers, in a time when the field of compiler construction was not as advanced as it is today.
www.xs4all.nl /~jmvdveer/algol68g-mk8/doc/resources.html   (1015 words)

 Algol, the Demon Star   (Site not responding. Last check: 2007-11-07)
Algol is bright, varying from 2nd magnitude to 3rd magnitude.
Algol seems to get dimmer when the K star passes between the B star and the earth, blocking the B star's light.
Algol also has a third star 1.5 times the mass and radius of the sun which orbits once in 1.86 years, and, as Kepler was clever enough to point out, the longer the orbit, bigger the orbit, so it's kind of out there doing its own thing.
astrosun.tn.cornell.edu /~brs/algol/main.html   (783 words)

 Shipwreck Algol
The Algol seemed to be sinking quite slowly, but as soon asher stern was awash, she went down like a rock, with air pockets causing waterto be spouted out of her stern.
We found the Algol to be sitting on a 45 degree angle on her port side.She was on a clean sand bottom in 120 feet of water.
Algol (AKA-54) was laid down on 10 December 1942 at Oakland, Calif., by the Moore Dry Dock Co. under a Maritime Commission contract (MC hull 1153) as SS James Barnes; launched on 17 February 1943; sponsored by Mrs.
www.aquaexplorers.com /shipwreck_Algol.htm   (6345 words)

 [No title]   (Site not responding. Last check: 2007-11-07)
Algol (the name is Arabic for "demon star"), is an excellent example of an eclipsing binary system because it has a period of about 2.87 days.
Algol should be easy to locate and view from almost anywhere in the northern hemisphere.
Algol is a relatively close star to our sun, at a distance of only 115 light years.
www.phantasy-star.net /algol.txt   (355 words)

 AllRefer.com - Algol, in astronomy, Star (Astronomy: Stars) - Encyclopedia
Algol's variation in apparent magnitude, from 2.06 to 3.28, is due to the fact that it is an eclipsing binary star, with one component revolving about the other with a period of 2 days, 20 hr, 49 min.
Algol is of spectral class B8 V and is about 105 light-years from the earth.
The name Algol comes from the Arabic Ras al Ghul, which means "demon's head," and the star is sometimes called the Demon Star.
reference.allrefer.com /encyclopedia/A/Algol.html   (211 words)

 USS Algol AKA-54, Steamin’ Demon, Underwater Photography, Scuba Diving, Stock Images, Screensavers, Screen ...
The Algol, affectionately known as the Steamin’ Demon was originally launched by the Moore Dry Dock Co and christened the James Baines on February 17, 1943 in Oakland, California.
Months later she was converted on December 3 of the same year to an auxiliary cargo attack vessel and renamed the USS Algol after the star that forms the head of Medusa in the Perseus constellation (the Demon Star).
Algol is a fixed star, in Medusa's head, in the constellation Perseus, well known for its periodic variation in brightness.
www.ecophotoexplorers.com /algol.asp   (1575 words)

Algol (Beta Persei) is the brightest eclipsing binary with deep eclipses.
Because of its brightness, Algol is potentially one of the most important star systems for studying mass transfer and mass loss in an interacting binary.
Algol varies in visual magnitude from 2.1 at maximum to 3.4 at primary minimum, with a period of 2.867315 days; this period, however, is slowly lengthening.
www.tmsc.org /astronomy/algol.html   (573 words)

 The Algol System
Additional evidence indicates that Algol is actually a triple star system, but two of the stars are very close together.
Algol is called the Winking Demon Star because of its light variation and because Perseus is according to mythology holding the severed head of the Gorgon or demon.
A blue spectral class B8 star with a diameter of 3 solar diameters and red-yellow spectral class K2 star of about 3.5 solar diameters are in very close orbit around each other (See the earlier discussion of spectral classes).
csep10.phys.utk.edu /astr162/lect/binaries/algol.html   (454 words)

 Algol Star System > Index
Algol (Various mythology) - Algol is a fixed star, in Medusa's head, in the constellation Perseus, well known for its periodic variation in brightness.
Homer wrote of Algol in the Iliad, describing it as, "...the Gorgon's head, a ghastly sight, deformed and dreadful, and a sight of woe".
In general, common names for Algol are The Demon, the Demon Star, the Blinking Demon, the Ghoul, and the Spectre's Head.
www.algol-star-system.net /library/mythology.htm   (1067 words)

 Hanoi: Algol-60
ALGOL (ALGOrithmic Language) is one of several high level languages designed specifically for programming scientific computations.
Although ALGOL never reached the level of commercial popularity of FORTRAN and COBOL, it is considered the most important language of its era in terms of its influence on later language development.
ALGOL's lexical and syntactic structures became so popular that virtually all languages designed since have been referred to as "ALGOL - like"; that is they have been hierarchical in structure with nesting of both environments and control structures.
www.kernelthread.com /hanoi/html/a60.html   (207 words)

 ALGOL   (Site not responding. Last check: 2007-11-07)
Although ALGOL never became widely used, for the next 20 years it was the major language used for publishing and communicating algorithms.
ALGOL is historically important to students because it introduced many new concepts.
Also, since ALGOL was used as the only language for publishing algorithms for such an extended period of time, students should be familiar with ALGOL so that they will be able to read and understand important papers and publications from that time.
www.cs.iastate.edu /~leavens/ComS541Fall97/hw-pages/history/algol.html   (268 words)

 The Horror-Scope of Algol - by Nick Kollerstrom   (Site not responding. Last check: 2007-11-07)
The freedom-fighter Joan of Arc (Algol conjunct Saturn) was burnt at the stake.
The ballet dancer Margot Fonteyn (Algol conjunct Mars) had a husband who was shot in the neck, leaving him paralysed: he had to watch her wonderful movements, himself immobile.
Their lead singers had direct Algol contacts to their natal charts, and each group had an artist who drew it together in the beginning, both of whom also had direct Algol contacts - and both of these were mysteriously bumped off in their prime: the horror-scope of Algol.
www.skyscript.co.uk /algol.html   (5286 words)

 ALGOL - Death Metal Band Homepage at algol.freeez.com   (Site not responding. Last check: 2007-11-07)
Algol was born in 2001 when two old metal friends, ANDY and GRAZZ met after some time.
With his arrival, the band is thus able to showcase the songs in an evolved form, having frequent harmonizations between the guitars.
Andrea decides to keep the old monicker for the new band, and the old songs, put aside when old Algol split-up, begin to raise to a new life and vitality: in a few rehersals, some of them are exhumed and revamped (Chaos Embrace, Sleepy Hollow, Dumb And Blind, Oblivion, Through Time And Space).
algol.freeez.com /about.html   (398 words)

 ALGOL   (Site not responding. Last check: 2007-11-07)
ALGOL is a programming language originally developed in the mid 1950s which became the de facto standard way to report algorithms in print for almost the next 30 years.
Note: throughout its effective life, the name of the programming language ALGOL was always presented in all-uppercase letters, and this is the practice we've adopted here.
The Burroughs Corporation's B5000 and its successors were stack machines designed to be programmed in an extended variant of ALGOL 60, known as Elliot ALGOL; indeed their operating system, or MCP as they are called, was written in Elliot ALGOL as far back as 1961.
www.yotor.org /wiki/en/al/ALGOL.htm   (565 words)

 Algol, Beta Persei   (Site not responding. Last check: 2007-11-07)
The binary nature of Algol was confirmed in 1889 by Hermann Carl Vogel (1841-1907) who found periodic Doppler shifts in the spectrum of Algol A (spectral class B8V), and the overlaying spectrum of the companion, Algol B, of type Am.
Algol A and B form a close binary system, the actual eclipsing binary, separated by only 10.4 million km.
Algol A is a white main-sequence star, while Algol B is believed to be a subgiant.
www.seds.org /~spider/spider/Vars/betaPer.html   (266 words)

 John Goodricke
In fact at the place of Algol in the picture of the constellation there is the head of the Medusa, which the Greek hero Perseus had killed with his mirror shield by her own look.
Algol or beta Perseï is a multi star system 96 lightyears away with two main components, where the central star is a massive, bright, white blue main class star (B8) with 3.7 solar masses at 2.9 times solar diameter and a 100 times higher absolute brightness than our Sun.
The nature of the Algol system were discovered through the spectroscopic analization of Algol's light applying the Doppler effect, postulated by Christian Andreas Doppler (1803-1853).
www.surveyor.in-berlin.de /himmel/Bios/Goodricke-e.html   (1502 words)

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