umbra

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umbra:

see eclipseeclipse
[Gr.,=failing], in astronomy, partial or total obscuring of one celestial body by the shadow of another. Best known are the lunar eclipses, which occur when the earth blocks the sun's light from the moon, and solar eclipses, occurring when the moon blocks the sun's light
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; sunspotssunspots,
dark, usually irregularly shaped spots on the sun's surface that are actually solar magnetic storms. The spots are darker because the temperature of the spots is lower than that of the surrounding photosphere (the visible surface of the sun).
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.
Umbral and penumbral regions of a shadowclick for a larger image
Umbral and penumbral regions of a shadow

umbra

(um -bră)
1. The dark inner region of a shadow cast by an object illuminated by a light of finite size rather than a pinpoint of light. The less dark outer region of the shadow is the penumbra (see illustration). The source of light is totally obscured to someone in the umbral region but only partly obscured in the penumbral region. See eclipse.
2. See sunspots.

umbra

[′əm·brə]
(astronomy)
The dark, central region of a sunspot.
(optics)
That portion of a shadow which is screened from light rays emanating from any part of an extended source.

umbra

1. a region of complete shadow resulting from the total obstruction of light by an opaque object, esp the shadow cast by the moon onto the earth during a solar eclipse
2. the darker inner region of a sunspot
References in periodicals archive ?
Mr Ashley's Sports Direct International, which owned 29.9% of Cheshire-based Umbro's shares, has agreed to sell two-thirds of its holding to Nike for pounds 56.1m.
Meanwhile, Sports Direct, the discount sportswear retailer controlled by billionaire Mike Ashley, increased its stake in Umbro to 29.9 per cent on October 30.
As well as England, Umbro now make a host of Premiership and Championship replica kits, including Sunderland, and the firm accounts for 10% of Sports Direct's turnover.
JJB Sports and Sports World have built up a combined 25 per cent stake in Umbro, offering a potential hurdle to the takeover.
For further information on Umbro World Cup boots visit www.umbro.com or call 0161 492 2222
During the Second World War, Umbro made uniforms for the Lancaster bombers.
However, Nike has since written down its investment as Umbro has struggled to grow sales and the US group has now decided to focus on its core brand and other faster-growing businesses such as Converse.
The American sportswear company, whose UK headquarters is in Sunderland, has given assurances to the Football Association over Umbro's England contract, which runs until 2014.
Sports Direct previously owned a 15 per cent stake, but the latest acquisition of Umbro shares will be enough for it to block the proposed acquisition by Nike.
Attention was focused on American sportswear giant Nike after Umbro said on Thursday it had received a takeover approach.
Numis Securities analyst Ramona Tipnis said: "England not qualifying will have a negative effect on not just Umbro's share price but also that of Sports Direct and JJB."
Sports gear manufacturer Umbro has launched its Umbro Football Heroes awards to honour unsung parents, supporters and volunteers in grassroots football.