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Direct sunlight has a luminous efficiency of about 93 lumens per watt of radiant flux, which includes infrared, visible, and ultra-violet light. Bright sunlight provides luminance of approximately 100,000 candela per square meter at the Earth's surface.

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Blogs for Sunlight

Sunlight Foundation Blog

Transparency in Government ... The Sunlight Foundation Blog. Should lobbyists be required to disclose anything? ... Search the Sunlight Blog. Simple Ways You ...blog.sunlightfoundation.com/

Sunlight Foundation

An educational organization that supports, develops, and deploys new technologies to make information about Congress and the federal government more accessible to citizens. Offers transparency grants and resources to make government groups accountable.www.sunlightfoundation.com/

Sunlight Labs: Blog

sunlight labs. blog. projects. wiki. about. contact us. Sharing Our Ideas ... from sunlight #gsoc student and 50states contributor: http://mindleak.com/blog ...sunlightlabs.com/blog/

Sunlight Labs

sunlight labs. blog. projects. wiki. about. contact us ... Sunlight Labs API ... Half the proceeds of the book go to us here at the Sunlight Foundation. ...www.sunlightlabs.com/

Sunlight

... popular works are offered on Sunlight, along with the lesser known ... Introduction to Sunlight Group ... [Sunlight] "Surrender to the will of my Beloved" ...sunlightgroup.blogspot.com/

Wikipedia About Sunlight

Sunshine%20at%20Dunstanburgh.JPG

Direct sunlight has a luminous efficiency of about 93 lumens per watt of radiant flux, which includes infrared, visible, and ultra-violet light. Bright sunlight provides luminance of approximately 100,000 candela per square meter at the Earth's surface.

Sunlight is a key factor in the process of photosynthesis, crucially important for life on Earth.

Calculation

To calculate the amount of sunlight reaching the ground, both the elliptical orbit of the Earth and the attenuation by the Earth's atmosphere have to be taken into account. The extraterrestrial solar illuminance (Eext), corrected for the elliptical orbit by using the day number of the year (dn), is:

E_{\rm ext}=E_{\rm sc}\left\cdot \cos\left(2\pi\frac{{\rm dn}-3}{365}\right)\right,

where dn=1 on January 1; dn=2 on January 2; dn=32 on February 1, etc. In this formula dn−3 is used, because in the modern times Earth's perihelion, the closest approach to the Sun and therefore the maximum Eext, occurs around January 3 each year.

The solar illuminance constant (Esc), is equal to 128×103 lx. The direct normal illuminance (Edn), corrected for the attenuating effects of the atmosphere is given by:

E_{\rm dn}=E_{\rm ext}\,e^{-cm},

where c is the atmospheric extinction coefficient and m is the relative optical airmass.

Solar constant

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Solar%20irradiance%20spectrum%201992.gif

The solar constant is the amount of incoming solar electromagnetic radiation per unit area, measured on the outer surface of Earth's atmosphere in a plane perpendicular to the rays. The solar constant includes all types of solar radiation, not just the visible light. It is measured by satellite to be roughly 1,366 watts per square meter (W/m²), though this fluctuates by about 6.9% during a year (from 1,412 W/m² in early January to 1,321 W/m² in early July) due to the Earth's varying distance from the Sun, and typically by much less than one part per thousand from day to day. Thus, for the whole Earth (which has a cross section of 127,400,000 km²), the power is 1.740×1017 W, plus or minus 3.5%. The solar constant does not remain constant over long periods of time (see Solar variation). The approximate average value cited, 1,366 W/m², is equivalent to 1.96 calories per minute per square centimeter, or 1.96 langleys (Ly) per minute.

The Earth receives a total amount of radiation determined by its cross section (π·RE²), but as it rotates this energy is distributed across the entire surface area (4·π·RE²). Hence the average incoming solar radiation (sometimes called the solar irradiance), taking into account the angle at which the rays strike and that at any one moment half the planet does not receive any solar radiation, is one-fourth the solar constant (approximately 342 W/m²). At any given moment, the amount of Solar radiation received at a location on the Earth's surface depends on the state of the atmosphere and the location's latitude.

Search results for Sunlight

Sunlight Foundation

Follow Sunlight on Twitter. Friend us at MySpace. Join our Facebook Group ... This work by Sunlight Foundation is licensed under a Creative Commons ...www.sunlightfoundation.com/exposingearmarks

Solar power - Wikipedia, the free encyclopedia

Sunlight can be converted into electricity using photovoltaics (PV) ... Concentrated sunlight has been used to perform useful tasks since the time of ancient China. ...en.wikipedia.org/wiki/Solar_power

Sunlight: Information from Answers.com

Sunlight Today, vampires are commonly portrayed as nocturnal creatures with a great aversion to sunlight ... The direct sunlight, like acid, caught Dracula's ...www.answers.com/topic/sunlight-3

Alkalize For Health - Sunlight is food! - Cancer Alternatives

Sunlight is important for cancer prevention because it is the best source of vitamin D. ... Ionizing radiation from sunlight, X rays, and other sources creates free ...www.alkalizeforhealth.net/sunlight.htm

Sunlight Labs

Sunlight Labs API ... Half the proceeds of the book go to us here at the Sunlight Foundation. ... Join Sunlight's growing list of open source civic coders that ...www.sunlightlabs.com/

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News about Sunlight

Hot for Home: 'Living Wall' vertical planter

The Star PressDETAILS: Get your garden growing -- vertically. This ingenious living wall is great for growing a garden in small spaces -- indoors or out. Plant one or display in multiples to create a living, oxygenating work of art in your entryway, kitchen or balcony ... anywhere that receives direct sunlight.http://www.thestarpress.com/article/20090510/LIFESTYLE/90510...

State Attorney General's office launches Project Sunlight

WUTR - WFXV UticaHerkimer, N.Y. - Project Sunlight is a new website that has been launched by the State Attorney General’s office to assist New Yorkers in finding out what their government is doing.http://cnyhomepage.com/content/fulltext/?cid=34571

Parks and forests at risk from foreign plants

WMCTV MemphisKudzu may get most of the attention, but workers at state parks say there are plenty of other invasive plants competing for space and sunlight.http://www.wmctv.com/global/story.asp?s=10334020

Parks and forests at risk from foreign plants

The Jackson SunCHATTANOOGA, Tenn. (AP) — Kudzu may get most of the attention, but workers at nearby state parks say there are plenty of other invasive plants competing for space and sunlight.http://jacksonsun.com/article/20090509/NEWS01/90509009/1002/...

Waterproof panel PC offers sunlight-readable option

Linux Devices— Apr. 29, 2009 — IEI Technology announced a rugged, Linux-ready, IP67-waterproof panel PC aimed at marine, avionics, military, mining, engineering, and industrial applications.http://www.linuxdevices.com/news/200904291435NS6823802248.ht...

News about Sunlight

GUEST COLUMN: Volunteer organization determined to make a difference

Star-PressWhen we moved the plywood we were greeted by bright sunlight. That might be normal, except that the light was shining down on us, through a hole in the roof big enough we could have lifted that sheet of plywood through it. Looking down in the ... http://www.thestarpress.com/article/20090510/OPINION/9051003...

Sweet corn planting peaks in May

Staunton News Leader ... preserve soil moisture as the season progresses. Corn plants in a wide block are better able to provide shade for the root zone of adjacent plants, whereas the soil around the base of plants in long, narrow stands is more exposed to direct sunlight.http://www.newsleader.com/article/20090510/LIFESTYLE/9051003...

Evidence piling up that worst of recession is over

Las Vegas SunThe winds are still howling, but I think we can see the sunlight on the distant horizon," said Mark Zandi, chief economist at Moody's Economy.com. "Clearly, the job losses are moderating." Wall Street investors could see the sunlight, too. The Dow ... http://www.lasvegassun.com/news/2009/may/10/evidence-piling-...

Pollution dims skies as well as befouling the air

NewsdayWASHINGTON (AP) — The skies are dimming, for most of the world. Increases in airborne pollution have dimmed the skies by blocking sunlight over the past 30 years, researchers report in Friday's edition of the journal Science. While decreases in ... http://www.newsday.com/features/lifestyle/green/sns-green-sc...

Sunlight Mountain pulls back on development plans

Aspen Daily NewsGLENWOOD SPRINGS, Colo. — Sunlight Mountain Resort has withdrawn an application to build 830 housing units and 110,000 square feet of commercial space at the resort. Resort general manager Tom Jankovsky says the decision will allow for more time to ... http://www.aspendailynews.com/section/home/134386

Search results for Sunlight

sunlight: Definition from Answers.com

sunlight ( ) n. The light of the sun; sunshine. ... The actinic rays of direct sunlight are known to have disinfectant properties, to be instrumental in the production of vitamin D ... http://www.answers.com/topic/sunlight

sunlight - Definition of sunlight at YourDictionary.com

Converse of subject illuminate: Illuminated by sunlight, the prints are transparent enough to see through to the outside urban surroundings.http://www.yourdictionary.com/sunlight

Sunlight

For those who love the poetry and stories of Jalal al-Din Rumi, the 13th century Sufi Mystic. Daily posts present a variety of translators and translations.http://sunlightgroup.blogspot.com/

sunlight - definition of sunlight by the Free Online Dictionary ...

sun·light (s n l t) n. The light of the sun; sunshine. sunlight. Noun. the light that comes from the sun . sunlit adj. Thesaurus Legend: Synonyms Related Words Antonymshttp://www.thefreedictionary.com/sunlight

Sunlight Corporate

Supplier of textile rental and laundering services.http://www.sunlight.co.uk/

Wikipedia results for Sunlight

Sunlight - Wikipedia, the free encyclopedia

Sunlight, in the broad sense, is the total spectrum of the electromagnetic radiation given off by the Sun. On Earth, sunlight is filtered through the atmosphere, and the solar ... http://en.wikipedia.org/wiki/Sunlight

Sunlight (disambiguation) - Wikipedia, the free encyclopedia

In business. Sunlight (cleaning product), a brand of laundry soap; Sunlight studios, a recording studio in Stockholm, Sweden; Sunlight Productions, a film and TV production companyhttp://en.wikipedia.org/wiki/Sunlight_(disambiguation)

Sunlight (Herbie Hancock album) - Wikipedia, the free encyclopedia

Sunlight is a 1977 Jazz-funk fusion album by keyboardist Herbie Hancock. Originally a UK import album, it features Hancock's vocals through a vocoder as well as performances by ... http://en.wikipedia.org/wiki/Sunlight_%28jazz_album%29

Sunlight (cleaning product) - Wikipedia, the free encyclopedia

Sunlight is a brand of household soap originally produced by the British company Lever Brothers in 1884. Designed for washing clothes and general household use, the success of the ... http://en.wikipedia.org/wiki/Sunlight_soap

Sunlight Foundation - Wikipedia, the free encyclopedia

The Sunlight Foundation is a 501(c)(3) educational organization [1] founded in January 2006 with the goal of increasing transparency in the United States Congress. [2]http://en.wikipedia.org/wiki/Sunlight_Foundation
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The benefits of sunlight

The benefits of sunlightMarch 10: Getting out in the sunshine can be very beneficial to your health. The Vitamin D that you get from the sun, not only helps your bones & teeth grow strong but it can also...Windows Media - Video

Tiny Tim - Living In the Sunlight

Tiny Tim - Living In the SunlightAnother clip from the Australian TV Special. Living In the Sunlight Loving In the MoonlightFlash - Video

Sunlight Electric - Light electrici...

Sunlight Electric - Light electricityrobsunlight: Sunlight Electric provides easy-to-buy, easy-to-afford commercial photovoltaic solutions for increased energy security and a cleaner world. The term photovoltaics...Flash - Video

NATURE: General views of sunlight t...

NATURE: General views of sunlight through treesVarious general views of sun light coming through tree branches and leavesMPEG 4 - Video

How To Take Pictures in Bright Sunl...

How To Take Pictures in Bright SunlightTransform bright light from a foe to a friend with a simple polarizing filter.Flash - Video

Answers for Sunlight

whoaSunlight???whoaIt will bleach...it won't turn blonde all the way, obviously, but you will see lighter highlights in your hair. Following one summer, I had numerous reddish streaks in my brown hair. Actually not a ba...Nogi WHow does the angle at which sunlight strikes Earth's surface affect the intensity of the sunlight?Nogi WImagine you have a pellet gun and a smooth, expansive and extremely level cement floor. The gun is the sun, the kinetic energy of the fired pellet is the energy of the sun. If you were to fire the...vn_jade_blueHow does sunlight affects both plants and animals ?vn_jade_blueWithout sunlight, there is no photosynthesis. Without photosynthesis, there is no oxygen. Without oxygen there is cellular respiration. Without cellular respiration, there is no animal life. Witho...water_skipperHow bright is sunlight as measured in photons per second over an area of the Earth?water_skipperWell since this is not a physics forum ...it is photography, yeah, I know they both start with ph. Since the "clean air" act, there are less particles in the air so I am sure the amount of light re...caféconazúcarHow do I look good in direct sunlight?caféconazúcarI always do my makeup in front of the window, I will even than go in the bathroom light to check it. I also have pale skin, I have a sister-in-law who is a make-up artist and I was just wondering why ...
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