See also: Earth, Solar, Sun, Umbra, Eclipse
Related Category: Astronomy: General
(pnm´br): see eclipse; sunspots.
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Eclipse - (klps´, -) [Gr.,=failing], in astronomy, partial or total obscuring of one celestial body by the shadow of another.
Penumbra at HighBeam Research
Penumbra on Wikipedia
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Definition: penumbra: Literally, "dim light"; the outer filamentary region of a sunspot.
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penumbra Portion of the shadow cast by an eclipsing object in which the eclipse is seen as partial.
perihelion The closest approach to the Sun of any object in orbit about it.
an event that occurs when the moon passes into the outer ring of Earth's shadow (penumbra), causing a slight shading in the moon's appearance
penumbra: the area of partial shadow surrounding the central umbra. It is due to the finite angular size of the sun. An observer standing in the penumbra would observe only part of the sun's disk.
penumbra -- the part of a shadow (as of the Moon) within which the source of light (the Sun) is only partially blocked out.
perigee -- the point in the orbit of the Moon that is closest to the Earth.
penumbra: A dark region that surrounds an even darker central area of a sunspot.
photosphere: The visible portion of the Sun.
Penumbra: The brighter area that surrounds the darker umbra or umbrae at the center of a sunspot. (go to first use in the text) ...
Penumbra Area of partial illumination in the shadow of a planet surrounding the Umbra. Also zone of intermediate brightness between a sunspot and the solar photosphere.
Penumbra. The sunspot area that may surround the darker umbra or umbrae. It consists of linear bright and dark elements radial from the sunspot umbra.
(a) Less than full shadow (umbra).
(b) 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.
Shadowed area in an eclipse where only part of the light source is blocked. Observers in the penumbral shadow of a solar eclipse see a partial eclipse.
Penumbra 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.
Penumbra- the outer part of an eclipse shadow; also, the lighter area surrounding the center of a sunspot
Perihelion- a planet or comet's closest approach to the sun
Periodic time- (see sidereal period) ...
The outer portion of the shadow during an eclipse. A partial eclipse will occur as the eclipsed object is not completely covered. The penumbra also refers to the outer region of a sunspot.
A Partial blocking of the Sun by the Earth creates an Penumbra Shadow. The Sunlight is dimmed but not extinguished.
Penumbra Eclipse ...
the area of partial illumination surrounding the darkest part of a shadow caused by an eclipse.
the point in the orbit closest to the planet.
Penumbra. (1). The lighter part of a sunspot. (2). The area of partial shadow either side of the main umbra cone of shadow cast by the Earth.
Perigee. The position of the Moon in its orbit when it is closest to the Earth.
penumbra: The portion of a shadow that is only partially shaded.
penumbral eclipse: A lunar eclipse in which the moon enters the penumbra of Earth's shadow but does not reach the umbra.
Penumbra - The outer part of the shadow of a body where sunlight is partially blocked by the body
Perihelion - The point in the orbit of a body when it is closest to the Sun ...
Part of the largest sunspot in Active Region 10030 recorded on 15 July 2002 with the Swedish 1-m Solar Telescope on La Palma.
The penumbra is the outer, relatively light region of a sun spot. It is shaped like an annulus (a ring) surrounding the darker, cooler umbra.
The penumbra is the outer, relatively light region of a shaped like an annulus (ring) surrounding the darker, cooler .
The penumbra is the area of partial shadow (compare to ).
The penumbra is the area of partial shadow (compare to umbra).
the region of a shadow from which part of the light source remains visible
penumbra - (n.)
(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 sunspot area that may surround the darker umbra or umbrae. In its mature form it consists of linear bright and dark elements radial from the sunspot umbra.
A penumbral eclipse occurs when the Moon passes through the Earthšs penumbra. The penumbra causes a subtle darkening of the Moon's surface.
A penumbral eclipse of the Moon. [H76]
Rotation of the line of apsides in the plane of the orbit; (in a binary) precession of the line of apsides due to mutual tidal distortion. [H76]
Apsides, Line of ...
The penumbral eclipse ends.
Partial Solar Eclipse : 1 August
WARNING! Never look at the Sun with the naked eye! ...
March 29, 2526
All Saros Series follow this progression.
(northern edge of shadow)
As described above, the Saros cycle is based on the recognition that 223 synodic months is to a good approximation equal to 242 draconic months and 239 anomalistic months.
When just the Penumbra shadow touches Earth, it is a partial eclipse of the sun in that place. Only part of the sun is blocked.
penumbra region of partial shadow that is outside the umbra; the light source is partially blocked.
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294. Penumbra Eclipse
When the moon passes only through the penumbra shadow of the earth or when the earth passes through only the penumbra shadow of the moon.
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.
penumbra literally, "dim light"; the outer filamentary region of a sunspot. perihelion the point in its orbit where a planet is closest to the Sun.
penumbra See umbra. penumbral eclipse See lunar eclipse, note. Per, Pers International Astronomical Union abbreviations for Perseus. See constellation.
A complex magnetic configuration of a solar sunspot group consisting of opposite polarity UMBRAe within the same PENUMBRA. Gamma.
A lighter part surrounding the umbra, in which the light is only partly cut off, is called the penumbra.
2. The darker central portion of a sun spot, surrounded by the lighter penumbra.
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 shadow cast by the Moon can be divided by geometry into the completely shadowed umbra and the partially shadowed penumbra.
Types of Solar Eclipses ...
Lunar eclipses can be full - the Moon passes completely through the Earth's umbral shadow, partial - it passes only through part of the umbral shadow, or penumbral - it only passes through the penumbra.
I did some quick trigonometry, and I get that the fuzzy outer part of the eclipse shadow (called the penumbra) should be about 1000 km across or so, while the deep shadow (the umbra) is a little bit bigger than the size of Titan itself, ...
For example, the ratio of the umbral areas (the darker part of the sunspot) to total spot area (including the lighter penumbra) changes abruptly in 1941/1942 and the ratio of the total sunspot area to the sunspot number changes dramatically with the ...
The Moon will entered the lighter, penumbral shadow of the Earth at 02.05 BST. At 03.03 BST the Moon entered the darker, umbral shadow. The shadow of the Earth then appeared to steadily move across the Moon until it was totally eclipsed by 04.13 BST.
Before the moon enters the umbra in either total or partial eclipse, it is within the penumbra and the surface becomes visibly darker.
After totality the partial phase starts with the left limb of the Moon brightening in the far less noticeable penumbral shadow. In London the Moon will still only be seven or so degrees up at half partial phase around 10.
The dark centre of a spot is called the umbra; the outer, lighter ring, the penumbra. Spots may be several times larger than the Earth or so small that telescopic observation is difficult. They may last for months.
Outside the umbra is the penumbra wherein the light source is partially visible. During solar eclipses, the eclipse can only be seen as total from within the umbral part of the Moon's shadow.
The second shadow is called the penumbra. This shadow becomes larger as it reaches the Earth. A total solar eclipse, or a complete blocking out of the Sun's light, can only be seen by those who live in the area covered by the umbra.
When viewed through a telescope, sunspots have a dark central region known as the umbra, surrounded by a somewhat lighter region called the penumbra. Sunspots are dark because they are cooler than the surrounding photosphere.
Particularly if the partial eclipse is nearly total, the unobscured part of the sun acts as an approximate line source of light. This means that objects cast shadows which have a very narrow penumbra in one direction, ...
The inner, darker part of a sunspot is the umbra, whereas the not-quite-so-dark outer part is the penumbra
They come in an 11-year (average) cycle in which they wax and wane in numbers ...
The shaded gray dot in the center of the graph is the penumbral shadow of the Earth at L2. In the center of the shadow the solar power to run MAP is cut by 80% so the trajectory is planned to avoid eclipses for as long as possible.
Around the edge of the sunspot, the field weakens, so this "penumbra" is a little brighter and shows radial streaks. Sometimes "light bridges" cross the umbra, like sparks jumping the gap in a spark plug.
Sunspots are regions of strong magnetic field on the sun's photosphere. They appear as dark areas on the sun's surface (the umbra) surrounded by a less dark penumbra. They may persist for days or even months.
is actually total or ring-formed in only a small band within this band (the eclipse path), and partial elsewhere (total eclipse takes place where the umbra of the Moon's shadow falls, whereas a partial eclipse is visible where the penumbra falls).
See also: Earth, Solar, Sun, Umbra, Eclipse