The notions of the penumbra and umbra are important in considering eclipses (q.v.).
The umbra in the former case becomes the fully illuminated portion, and vice versa.
Each spot shows with more or less completeness a ring-shaped penumbra enclosing a darker umbra; the umbra, which looks black beside' the photosphere, is actually about as brilliant as limelight.
The umbra of a spot is generally not tormented by rapid line-of-sight motions; where any motion has been found G.
the true shadow or umbra, and also a definite boundary of the parts wholly illuminated.
Marcion, for example, regarded the body of Christ merely as an "umbra," a "phantasms."
sombre, gloomy, possibly from sub umbra, beneath the shade, is given as a parallel.
Readers of Dante know the idea that the dead have no shadows; this was no invention of the poet's but a piece of traditionary lore; at the present day among the Basutos it is held that a man walking by the brink of a river may lose his life if his shadow falls on the water, for a crocodile may seize it and draw him in; in Tasmania, North and South America and classical Europe is found the conception that the soul - o-tab., umbra - is somehow identical with the shadow of a man.
Some lines of certain elements are always seen fainter or thinner than on the photosphere, or even wholly obliterated; others sometimes show the same features, but not always; other lines of the same elements, perhaps originating at a level above the spot, are not affected; there are also bright streaks where even the general absorption of the spot is absent, and sometimes such a bright line will correspond to a dark line on the photosphere; most generally the lines are intensified, generally in breadth, sometimes in darkness, sometimes in both together, sometimes in one at the expense of the other; certain lines not seen in the photosphere show only across the umbra, others cross umbra and penumbra, others reach a short distance over the photosphere.
His attitude about this time to life and experience is reflected in Pulvis et umbra, one of the noblest of all his essays.
NOCERA UMBRA (anc. Nuceria Camellaria), a town and episcopal see in the province of Perugia, Italy, 12 M.
John Fleischer (sometimes incorrectly named Fletcher), of Breslau, propounded the same view in a pamphlet, De iridibus doctrina Aristotelis et Vitellonis (1574) the same explanation was given by Franciscus Maurolycus in his Photismi de lumine et umbra (1575) The most valuable of all the earlier contributions to the scientific explanation of rainbows is undoubtedly a treatise by Marco Antonio de Dominis (1566-1624), archbishop of Spalatro.
In a partial lunar eclipse, it partly enters the umbra and only part of its surface is darkened.
The largest spots are easily seen by the naked eye, if the brilliancy of the disk is veiled; the umbra may be many - ten or more - diameters of the earth in breadth.
About the same time Francesco Maurolico, or Maurolycus, the eminent mathematician of Messina, in his Theore y nata de Lumine et Umbra, written in 1521, fully investigated the optical problems connected with vision and the passage of rays of light through small apertures with and without lenses, and made great advances in this direction over his predecessors.
When the slit of the spectroscope is set across a spot, it shows, as might be expected, a general reduction of brightness as we pass from the photosphere to the penumbra; and a still greater one as we pass to the umbra.
adorable umbra splish.
cankers on umbra tree caused by Fusarium species.
All but the smallest spots show a dark central portion called the umbra with a lighter outer area called the penumbra.
umbra tree caused by Fusarium species.
Gnoli, L'Arte umbra alla mostra di Perugia, Bergamo, 1908).
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Umbra is a home design company formed in 1979 with the first product, a window shade, giving the company its name; "umbra" is "shade" in Spanish.
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This may be the reason that Umbra has the most styles to choose from in this category.
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The word usage examples above have been gathered from various sources to reflect current and historial usage. They do not represent the opinions of YourDictionary.com.