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 ?
Umbro told the City it had received a bid approach, but declined to reveal the identity of the interested party or parties.
We have worked extremely hard over the last few months to find a technical partner that we feel share our future aspirations and brand values and believe that UMBRO are all of these things.
Traditionally, the more lucrative endorsement contracts are reserved for goalscorers and glamour players - David Beckham rakes it in from adidas, while Umbro have Michael Owen and Alan Shearer on lucrative deals.
Umbro has said Terry's deal, which is worth an estimated four million pounds, would remain in place pending his trial in July following England's Euro 2012 campaign.
All players attending the event received a complimentary pair of new Umbro football boots and kit, certificate of achievement as well as loads of advice and support from many of the Irish Leagues top stars.
Nike vice president Eunan McLaughlin said: "We felt the combination of Nike with Umbro gives us a clear leadership in football globally and would be one of those merger opportunities made in heaven.
The American firm, whose UK head office is in Sunderland, said the proposed takeover of Cheadle-based Umbro would "significantly expand" its presence in a key growth market.
Umbro is looking to reduce its exposure to the cyclical nature of licensed product sales - such as England kits - by increasing sales of branded goods by more than 10% and boosting its international presence.
The development of the country is well documented and Umbro is working with its licensee to continue to exploit the enormous potential of the Chinese market.
The Umbro deal evokes memories of Albion's last association with the company, which lasted from the late 1970s until 1988.