Janus


Also found in: Dictionary, Thesaurus, Medical, Acronyms, Wikipedia.

Janus

(jā`nəs), in astronomy, one of the named moons, or natural satellites, of SaturnSaturn,
in astronomy, 6th planet from the sun. Astronomical and Physical Characteristics of Saturn

Saturn's orbit lies between those of Jupiter and Uranus; its mean distance from the sun is c.886 million mi (1.
..... Click the link for more information.
. Also known as Saturn X (or S10), Janus is an irregularly shaped (nonspherical) body measuring about 122 mi (196 km) by 119 mi (192 km) by 93 mi (150 km); it orbits Saturn at a mean distance of 94,120 mi (151,472 km), and has equal orbital and rotational periods of 0.6945 earth days. The French astronomer Audouin Dollfus is credited with the discovery of Janus in 1966. However, in 1978, the American astronomers Stephen M. Larson and John W. Fountain determined that there were two moons orbiting Saturn at a distance of about 94,000 mi, and it was not until 1980 that the Voyager 1 space probe provided sufficient data to enable Janus to be distinguished from EpimetheusEpimetheus,
in astronomy, one of the named moons, or natural satellites, of Saturn. Also known as Saturn XI (or S11), Epimetheus is an irregularly shaped (nonspherical) body measuring about 89 mi (144 km) by 67 mi (108 km) by 61 mi (98 km); it orbits Saturn at a mean distance of
..... Click the link for more information.
; today it is difficult to say which one Dollfus really discovered. Janus and Epimetheus are co-orbital, that is, they share the same average orbit; about every fourth year—at closest approach—the lower, faster satellite overtakes the other, they exchange angular momentum, and the lower one is boosted into a higher orbit while the higher one drops to the lower orbit. The two moons may have formed from the disruption of a single satellite early in the formation of Saturn's satellite system. Janus's surface is extensively cratered, with several larger than 18 mi (30 km); however, there are few linear features.

Janus

(jā`nəs), in Roman religion, god of beginnings. He was one of the principal Roman gods, the custodian of the universe. The first hour of the day, the first day of the month, the first month of the year (which bears his name) were sacred to him. His chief function was as guardian deity of gates and doors. The gates of his temple in the Roman Forum were closed in time of peace and opened in time of war. Janus was usually represented with two bearded heads placed back to back so that he might look in two directions at the same time. His principal festival was celebrated on the first day of the year.
The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/

Janus

(jay -nŭs) A small satellite of Saturn. The name Janus was originally given to a satellite of Saturn discovered in 1966 by the French astronomer Audouin Dollfus, but its existence was not confirmed. The name Janus has since been given to one of the two coorbital satellites discovered in 1980 at approximately the orbital distance given by Dollfus. The other satellite is Epimetheus. Four craters have been named on Janus: Castor, Idas, Lynceus, and Phoibe. See Table 2, backmatter.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

Janus

[′jā·nəs]
(astronomy)
A satellite of Saturn which orbits at a mean distance of 151,000 kilometers (94,000 miles) and has an irregular shape with an average diameter of 190 kilometers (120 miles).
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

bifrons

bifrons
Having two fronts or faces looking in opposite directions, as a double herm.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

Janus

(1)
Distributed language with an ask/tell constraint system.

qdjanus is a Janus-to-Prolog compiler for Sicstus Prolog and jc is compiles to C.

["Janus: A Step Towards Distributed Constraint Programming", V. Saraswat <saraswat@parc.xerox.com> et al in Logic Programming: Proc 1990 North Am Conf, S. Debray et al eds, MIT Press 1990].

["Programming in Janus", Saraswat, Kahn, and Levy].

Janus

(2)
W.M. Waite, U Colorado. Intermediate language, claimed as an implementation of UNCOL. Used on CDC 6600.

["Experience with the Universal Intermediate Language Janus", B.K. Haddon et al, Soft Prac & Exp 8(5):601- 616 (Sep 1978)].
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)
References in periodicals archive ?
Workers who should be able to opt out of union membership and paying union fees under the Janus vs.
The diagrammatic sketch for the synthesis of Janus composite microspheres was showed in Figure I.
The band's sound was classic thrash-inflected metal, with Janus, one of the few female vocalists in the genre, featuring on songs such as Spell Eater, Eight Of Swords, and Sorrow.
And this is the reason for the show in front of City Hall, and this is the reason so many politicians in states like New York want to scare you about Janus.
Janus' lawyers note that these claims "turn, to a large degree, on self-interested judgments by union officials about how they and other union employees spend their time."
Janus offers integrated stability operations services, including humanitarian munitions remediation, environmental remediation and services, risk management, and logistics and lifecycle support solutions to public and private sector clients worldwide.
While 'Janus Silang 1' dealt with our boy-hero's encounters with a malevolent tiyanak, 'Janus Silang 2' chronicles his adventures amid an imminent war between the lofty manananggals and the crafty mambabarangs.
Able Device is excited to demonstrate SIMbae's IoT application hosting capabilities using the Janus plug-in modem for two reasons; the first being that its configuration is the perfect platform for exploiting all of the advantages of SIMbae driven IoT applications, said Roger Dewey, Able Device CEO.
To focus on home bias and other prominent industry trends, Janus Henderson tracked the average allocations across the thousands of advisor models it analyzes.
INVESTMENT MERGER Shares in Henderson Group surged yesterday after it announced a merger with US firm Janus Capital, creating an investment titan with more than $320bn (PS247bn) in assets under management.
M2 PHARMA-August 24, 2015-Roche collaborates with Janus Biotherapeutics
William Janus has been named president and publisher of the Daily Times in Salisbury, Md.