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penumbra
noun
pen·um·bra pə-ˈnəm-brə 
plural penumbrae pə-ˈnəm-(ˌ)brē
-ˌbrī
or penumbras 1
a
: a space of partial illumination (as in an eclipse) between the perfect shadow on all sides and the full light
b
: a shaded region surrounding the dark central portion of a sunspot
Did you know?
Every solar eclipse casts an umbra, the darker central area in which almost no light reaches the earth, and a penumbra, the area of partial shadow where part of the sun is still visible. Penumbra can thus be used to describe any "gray area" where things aren't all black and white. For example, the right to privacy falls under the penumbra of the U.S. Constitution; though it isn't specifically guaranteed there, the Supreme Court has held that it is implied, and thus that the government may not intrude into certain areas of a citizen's private life. Because its existence is still shadowy, however, the Court is still determining how much of an individual's life is protected by the right to privacy.
Example Sentences
the lunar eclipse began with a subtle darkening of the lunar surface as it passed within the Earth's penumbra a penumbra of despair fell over the doomed city
Recent Examples on the Web This is from the Earth’s lighter shadow, called the penumbra, that is barely visible to the naked eye. 
Dean Regas, The Enquirer, 10 May 2022 The whole moon is in Earth’s penumbra, but the dimming is subtle. Leigh Morgan, al, 15 May 2022 In eastern Wisconsin the spectacle is scheduled to begin at 8:32 p.m. Sunday when the edge of the Earth's shadow, or penumbra, starts touching the moon. Paul A. Smith, Milwaukee Journal Sentinel, 14 May 2022 As Picasso’s palette became more relentlessly monochromatic, space itself seemed to squeeze these figures into more compressed forms, containing them with a dark penumbra of rich blue, as if the world could not allow them even a little air or light. Washington Post, 3 Mar. 2022 There’s a whole penumbra of horrible things that happen after. Jonathan Blitzer, The New Yorker, 22 Dec. 2021 This is made up of the time when the Moon hits the penumbra and umbra. Joshua Hawkins, BGR, 17 Nov. 2021 The penumbra is the outer edge of the Earth's shadow, lasting over six hours, and the umbra is the deepest part of the shadow, lasting 3.5 hours. Sherry Liang, CNN, 18 Nov. 2021 That’s when the penumbra, partial shadow, first becomes visible. Joe Mario Pedersen, orlandosentinel.com, 18 Nov. 2021 See More
Dean Regas, The Enquirer, 10 May 2022 The whole moon is in Earth’s penumbra, but the dimming is subtle. Leigh Morgan, al, 15 May 2022 In eastern Wisconsin the spectacle is scheduled to begin at 8:32 p.m. Sunday when the edge of the Earth's shadow, or penumbra, starts touching the moon. Paul A. Smith, Milwaukee Journal Sentinel, 14 May 2022 As Picasso’s palette became more relentlessly monochromatic, space itself seemed to squeeze these figures into more compressed forms, containing them with a dark penumbra of rich blue, as if the world could not allow them even a little air or light. Washington Post, 3 Mar. 2022 There’s a whole penumbra of horrible things that happen after. Jonathan Blitzer, The New Yorker, 22 Dec. 2021 This is made up of the time when the Moon hits the penumbra and umbra. Joshua Hawkins, BGR, 17 Nov. 2021 The penumbra is the outer edge of the Earth's shadow, lasting over six hours, and the umbra is the deepest part of the shadow, lasting 3.5 hours. Sherry Liang, CNN, 18 Nov. 2021 That’s when the penumbra, partial shadow, first becomes visible. Joe Mario Pedersen, orlandosentinel.com, 18 Nov. 2021 See More 👨🏻🏫 Mr. Ng 韋氏詞典 📚 – mw.mister5️⃣.net
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