Research topic:sky

Pictures from Google Image Search

Click to see an enlarged picture
Click to see an enlarged picture
Click to see an enlarged picture
Click to see an enlarged picture
Find more facts and information on our topic page about sky

sky brightness

A Dictionary of Astronomy | 1997 | © A Dictionary of Astronomy 1997, originally published by Oxford University Press 1997. (Hide copyright information) Copyright

sky brightness The brightness of the night sky in the absence of twilight and moonlight, measured in areas of sky devoid of discernible stars. It arises from the airglow, and from the zodiacal light and gegenschein, all of which vary with solar activity. There is a further component from the many stars and galaxies in the sky which are too faint to be seen individually but produce a significant background brightness. Sky brightness is measured in magnitudes per square arc second. The best mountain‐top sites have a zenith sky brightness in the V band of around 21.8 magnitudes per square arc second, while 18.1 is typical for light‐polluted sites. A lower sky brightness allows the detection of fainter objects. Telescopes in orbit are also affected by sky brightness, but not so greatly.

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"sky brightness." A Dictionary of Astronomy. 1997. Encyclopedia.com. 1 Dec. 2009 <http://www.encyclopedia.com>.

"sky brightness." A Dictionary of Astronomy. 1997. Encyclopedia.com. (December 1, 2009). http://www.encyclopedia.com/doc/1O80-skybrightness.html

"sky brightness." A Dictionary of Astronomy. 1997. Retrieved December 01, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O80-skybrightness.html

Learn more about citation styles

Related newspaper, magazine, and trade journal articles from HighBeam Research

(Including press releases, facts, information, and biographies)

Sky Expands Online TV Service With 6 More Live Channels.
PR Newswire Europe; 3/6/2009; 700+ words ; LONDON, March 6 /PRNewswire/ -- Sky has expanded its online TV offering with the addition of six new live TV channels, including two Sky Movies' channels. Sky has added Sky Movies Screen 1 and 2, Nat Geo Wild, Eden...
SKY MobileMedia Announces Hardware Validation Solution for SKY-MAP Mobile Software Platform; SKY-RVP Reference Platform Accelerates Wireless Handset Time-to-Market Through Hardware and Software Integration and Pre-Validation.
Business Wire; 5/31/2005; 700+ words ; SAN DIEGO -- SKY MobileMedia, Inc., a leading provider...industry, today announced the release of SKY-RVP(TM) Reference Validation Platform...development, prototyping and testing using the SKY-MAP(TM) mobile applications software...
Sky Player TV Uses Microsoft Silverlight and PlayReady Technology.
PR Newswire Europe; 12/4/2008; 700+ words ; ...Microsoft Silverlight and PlayReady technologies are enabling Sky Player TV, Sky's online TV service. Launched today, the service...of an online-only subscription. The new version of Sky Player TV, which in addition continues to be offered...
Sky Cuts Energy Use with Automatic Standby.
M2 Presswire; 3/20/2007; 700+ words ; M2 PRESSWIRE-20 March 2007-SKY: Sky Cuts Energy Use with Automatic Standby(C)1994-2007 M2 COMMUNICATIONS LTD RDATE:20032007 Sky is to help customers reduce their household energy bills with the...
SKY MobileMedia Closes $15 Million Series B Financing; Announces Former Ericsson Executive Ake Persson as Chairman of the Board of Directors.
Business Wire; 1/17/2006; 700+ words ; SAN DIEGO -- SKY MobileMedia, Inc., a leading provider...Venture Capital of La Jolla, California, SKY's Series A lead investor, also participated...B funding. With the close of Series B, SKY MobileMedia has raised over $21 million...
Sky Capital LLC Investment Research Initiates Coverage With Strong Buy On: General Electric, McDonald's & Home Depot; 12-Month Price Targets Set at $33 for GE, $20 for MCD, and $30 for HD.
PR Newswire; 3/7/2003; 700+ words ; Sky Capital LLC, a subsidiary of Sky Capital Holdings, Ltd. (AIM: SKY.L), today announced that it has initiated research coverage on three of the world's most widely recognized companies: General Electric, Co. , McDonald's Corp...
Sky Television to boost spending by $35M.
Magazine article from: Multichannel News; 7/9/1990; ; 700+ words ; Sky Television To Boost Spending by $35M LONDON - Sky Television next year will boost program spending by $35 million...Murdoch, chairman. At a press conference last week to discuss Sky's progress since it began Feb. 6, 1989, Rupert Murdoch...
Sky Financial Group to Hold Fourth Quarter Earnings Conference Call and Webcast.
PR Newswire; 12/22/2003; 700+ words ; Sky Financial Group, Inc. today announced it...available the morning of January 22 on the Sky website ( http://www.skyfi.com...Kevin Thompson, chief financial officer of Sky Financial Group, will provide an overview...
Sky Announces Pending Acquisition of Belmont Bancorp.
PR Newswire; 12/22/2004; 700+ words ; Sky Financial Group, Inc. (Bowling Green, Ohio...the execution of a definitive agreement for Sky Financial to acquire Belmont and its wholly...in Ohio and Ohio County in West Virginia. Sky Financial and Belmont anticipate that the transaction...
Sky Announces the Completion of Its Acquisition of Belmont Bancorp.
PR Newswire; 6/3/2005; 700+ words ; ...June 3 /PRNewswire-FirstCall/ -- Sky Financial Group, Inc. announced today...June 1, 2005. The acquisition increases Sky's asset size to $15.2 billion. Belmont National Bank (BNB) will merge with Sky Financial's subsidiary, Sky Bank, at...

Related entries from encyclopedias, dictionaries, and thesauruses

sky
Book article from: The Oxford Pocket Dictionary of Current English sky / skī / • n. ( pl. skies ) (often the sky ) the region of the atmosphere and outer space...he wrote to his sister praising Lizzie to the skies. DERIVATIVES: sky·ey / ˈskīē...
Blue Sky Law
Encyclopedia entry from: West's Encyclopedia of American Law BLUE SKY LAW A popular name for state statutes providing...investing in fraudulent companies. Most blue sky laws require the registration of new issues...documents for accuracy and completeness. Blue sky laws also often regulate securities brokers...
Blue Sky Boys
Book article from: Contemporary Musicians Blue Sky Boys Country music duo In June of 1936, Bill...name from the Bolick Brothers to the Blue Sky Boys, the young musicians were on their way...slogan "Blue Ridge Mountains, Land of the Sky," Earl and Bill Bolick became the Blue Sky...
British Sky Broadcasting Group plc
Book article from: International Directory of Company Histories British Sky Broadcasting Group plc 6 Centaurs Business...7705-3030 Web site: http://www.sky.com Public Company Incorporated: 1988 as...digital satellite television operator British Sky Broadcasting Group plc, better known as BSkyB...
Riders in the Sky
Book article from: Contemporary Musicians Riders in the Sky Western music group For the Record …...Every time they step on stage, Riders in the Sky give their audience an enthusiastic greeting...x2019; s Roundup, Featuring Riders in the Sky , an album that grew out of their work on...

Related research topics

For students and teachers!

Encyclopedia.com provides students and teachers facts, information, and biographies from verified, citable sources, including:

Encyclopedia.com provides students and teachers facts, information, and biographies from verified, citable sources, including: