Definition of Penumra
Penumbra, the name given to the partial shadow on the rim of the
total shadow of an eclipse, also to the margin of the light and shade of
a picture.
- Wikipedia
Pe*num"bra (?), n. [NL., fr. L.
paene almost + umbra shade.] 1. An
incomplete or partial shadow.
2. (Astron.) The shadow cast, in an
eclipse, where the light is partly, but not wholly, cut off by the
intervening body; the space of partial illumination between the umbra,
or perfect shadow, on all sides, and the full light. Sir I.
Newton.
&fist; The faint shade surrounding the dark central portion of a
solar spot is also called the penumbra, and sometimes
umbra.
3. (Paint.) The part of a picture where
the shade imperceptibly blends with the light.
- Webster's Unabridged Dictionary (1913)
- a partially shaded area around the edges of a shadow, especially an eclipse.
- a region around the edge of a sunspot, darker than the sun's surface but lighter than the middle of the sunspot.
Portuguese
- situation of low light
- The Nuttall Encyclopedia
You arrived at this page by searching for Penumra
The correct Spelling of this word is: Penumbra
Thank you for visiting FreeFactFinder. On our home page you will find extensive articles covering
a wide range of topics.
|
