that portion of a shadow in semi-shade between the darkest, or umbra, and the un-shadowed zone
outer and lighter part of the shadow created by an eclipse.
The portion of a shadow the receives direct light from only part of the light source.
1) A partial shadow cast by the Earth or Moon that surrounds the umbra, or total shadow. During a total lunar eclipse, the Moon passes through the Earth's penumbra, then into the umbra where the Moon "disappears". Similarly, during a total solar eclipse, the Earth passes through the Moon's penumbra, and then into its umbra. 2) The region immediately surrounding the darkest portion, or umbra, of a sunspot. This region is darker and cooler than the surrounding photosphere, but lighter and hotter than the center of the sunspot.
portion of the shadow from which part of the light source is excluded when a body passes over the light source.
The outer, dimly lit section of a spotlights cone of light. The penumbra surrounds the umbra and merges with the surrounding deep shadow
The brighter area that surrounds the darker umbra or umbrae at the center of a sunspot. ( go to first use in the text)
(a.) For an eclipse, the part of the shadow from which the sun or other radiating body is only partially occulted; (b) of a sunspot, the outer region of the sunspot, not as dark as the central umbra.
The outer shadow cast during an eclipse. It is also the lighter area surrounding the central region of a sunspot. Penumbra is Latin for dim light.
1. the partly lighted area surrounding the complete shadow of a body, as in an eclipse of the moon. 2. a partly lighted area around any area of full shadow.
The edge of the primary body's shadow.
The shadow cast when the incident radiation is partly, but not wholly cut off by an intervening body; the space of partial illumination between the umbra, or perfect shadow or all side and the full light. A marginal region on borderland or partial obscurity.
Faint outer shadow; partial eclipses are seen from within this shadow.
The part of a shadow in which the light (or other rays such as the solar wind) is only partially masked, in contrast to the umbra in which light is completely masked, by the intervening object.
Portion of the shadow cast by an eclipsing object in which the eclipse is seen as partial.
region of partial shadow that is outside the umbra; the light source is partially blocked.
an annulus (thick ring) around the umbra of a sunspot
an astronomical term describing the partial shadow in an eclipse or the edge of a sunspot -- and it is another way to describe something unclear or uncertain
a partly shaded region around the shadow of an opaque body
The sunspot area that may surround the darker umbra or umbrae. It consists of linear bright and dark elements radial from the sunspot umbra.
the larger shadow cast by the Moon during a solar eclipse.
the incomplete part of a shadow surrounding the umbra
the area of partial shadow cast by an opaque object; the blurry edges of the shadow
The area traced on a planet during an eclipse where only a portion of the eclipsed light source is blocked. Observers in the penumbral shadow of a solar eclipse, for instance, see only a partial eclipse. See also umbra.
Means, literally, "dim light". It most often refers to the outer shadow cast during eclipses, and defines the region of shadow which gives rise to a partial eclipse. It is also the lighter area surrounding the central region of a sunspot.
The part of a shadow that some light rays have been blocked.
the region of a shadow from which part of the light source remains visible
The outer, not completely dark part of a shadow; the region from which the source of light is not completely hidden.
During an eclipse, the area of partial shadow.
Literally "next to the umbra". (i) The shadow that results when only part of the bright object is occulted; e.g. an observer will see a partial eclipse when he is in the penumbra of the shadow of the moon. (ii) The lighter area surrounding a sunspot.
A dark region that surrounds an even darker central area of a sunspot.
It is the outer part of a shadow. - It is the larger part. - The penumbra causes a partial eclipse.
A fringe region of partial shadow around an umbra.
the portion of a shadow in which light from an extended source is partially but not completely cut off by an intervening body; the area of partial shadow surrounding the umbra.
The part of a shadow (as of the Moon) within which the source of light (the Sun) is only partially blocked out.
The outer filamentary region of a sunspot.
A partial shadow between regions of complete shadow and complete illumination.
The zone of partial shadow between bright illumination and complete shadow. See also umbra.
The lighter, outer zone of the Moon's shadow visible during a solar eclipse. It surrounds the umbra, or dark central zone of the shadow.
Literally partial shadow; the partially lighted area around any completely darkened area (umbra) of full shadow.
The lighter part of a shadow during an eclipse. An observer standing in the penumbra of a Solar eclipse will see a partial eclipse. This word can also mean the lighter part of a sunspot. See also umbra
The penumbra (Latin for almost-shadow) is the portion of a shadow that results from the source of illumination being only partially blocked. Penumbras occur only when the source of light is not a point source. As the sun is a visible disc, solar shadows have penumbras.