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n. (context physics astronomy English) A unit of brightness (of the sky at night) equal to 1010/4π quanta per square meter per second per steradian

Rayleigh (lunar crater)

Rayleigh is a lunar crater that lies along the northeast limb of the Moon. This feature is seen edge-on from Earth, making it difficult to see much detail. In addition, libration effects can completely hide this crater from view. It lies just to the north of Lyapunov, and to the northwest of the large Joliot. Attached to its southwest rim is the smaller Urey.

This is an eroded formation with a rim that has been worn and reshaped by impacts. This is particularly so in the south where the rim has been modified and supplemented by adjacent crater formations and several small craters that lie along the rim.

The interior floor is relatively level in places, but, partly due to overlapping ejecta, is somewhat rough and irregular in others, particularly in the southern half. A pair of small but prominent craters lies on the interior surface, with Rayleigh D just to the south of the crater midpoint and the smaller Rayleigh B situated in the western half.

Rayleigh was named for John William Strutt, 3rd Baron Rayleigh.

Rayleigh (UK Parliament constituency)

Rayleigh was a parliamentary constituency in Essex represented in the House of Commons of the Parliament of the United Kingdom. It elected one Member of Parliament (MP) by the first past the post system of election. It existed from 1997 to 2010.

Rayleigh (unit)

The rayleigh is a unit of photon flux, used to measure airglow ( auroras, for example). It was first proposed in 1956 by D. M. Hunten, Franklin E. Roach, and J. W. Chamberlain. It is named for Robert John Strutt, 4th Baron Rayleigh (1875–1947). Its symbol is R (also used for the röntgen, an unrelated unit). SI prefixes are used with the rayleigh.

One rayleigh (1 R) is defined as a column emission rate of 10 photons per square metre per column per second. Note that rayleigh is an apparent emission rate, as no allowances have been made for scattering or absorption. The night sky has an intensity of about 250 R, while auroras can reach values of 1000 kR.

The relationship between photon radiance, L, (in units of photons per square metre per second per steradian) and I (in units of rayleighs) is

I = 4π10L


Rayleigh may refer to:

Rayleigh (Martian crater)

Rayleigh Crater is an impact crater in the Mare Australe quadrangle of Mars, located at 75.6°S latitude and 240.9°W longitude. It is 148.7  km in diameter and was named after Lord Rayleigh, and the name was approved in 1973 by the International Astronomical Union (IAU) Working Group for Planetary System Nomenclature (WGPSN). The pictures show layered features. These features may have resulted from the erosion of layers of mantle.

Wikirayleigh.jpg|Rayleigh (Martian crater), as seen by CTX camera (on Mars Reconnaissance Orbiter). Wikirayleighlayers.jpg|Layers in Rayleigh crater, as seen by CTX camera (on Mars Reconnaissance Orbiter). Note: this is an enlargement of the previous image of Rayleigh crater.

Usage examples of "rayleigh".

Marquis and Marchioness of Rayleigh held a great ball and the whole world came to it.

UFO reveries, saw them clearly any number of times, though she got teased, popping in and out of the sky-blue Rayleigh scattering as if through a perfectly elastic sheet, advance units for some other force, some pitiless advent.

I recall offhand, Tywood has published papers on the effect of liquid viscosity on the wings of the Rayleigh line, on higher-orbit field equations, and on spin-orbit coupling of two nucleons, but his main work is on quadrupole moments.

The manufacturing processes conform to the environmental regulations of the country of origin ISBN 0 434 01009 X Typeset by SX Composing DTP, Rayleigh, Essex Printed and bound in Great Britain by Clays Ltd, St.

I walked beside him and Nicky through the front door of Rayleigh House.

I would write to Savile and ask him to keep her at Rayleigh until I had a place for her.

All the horses can go to Rayleigh until we find you another place to live.

Here, besides several leading men of science from our own country, were Lord Kelvin, Lord Rayleigh, Professor Roentgen, Dr.

Write to Simon and Laraine Gosden, Fantastic Literature, 35 The Ramparts, Rayleigh, Essex SS6 8PY, UK.

Two types of surface waves, named after British physicist Lord Rayleigh and British geophysicist A.

This limit, called the Rayleigh criterion, is proportional to the wavelength of the light being focused divided by the lens aperture.

For this reason, a focus can be achieved that is independent of the aperture of the material and sharper than that predicted by the Rayleigh criterion.

In Basildon and Rayleigh they trigger a panicky dash back to the island by parents and partners working on the mainland.

The station is controlled from Rayleigh and even before the sirens sound, the Chief Inspector for the Division begins pulling men off crime teams and traffic to help with the emergency.

Outside the glary cone of his headlamp's beam, the ice was an intense cobalt blue, an effect caused by the same Rayleigh scattering that blued the color of the sky.