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Penumbra

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Penumbra
Related Category: Astronomy: General
(pnm´br): see eclipse; sunspots.
More on Penumbra
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.
Space Tragedies9 Planets in Nine DaysAstronomy 101
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Penumbra - faint outer shadow. Penumbral lunar eclipses occur when the Moon passes through the penumbral shadow but are very difficult to observer so are of internest mainly to astonomers.

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.

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. The sunspot area that may surround the darker umbra or umbrae. It consists of linear bright and dark elements radial from the sunspot umbra.

Penumbra
(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.
Percolation ...

Penumbra
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) ...

penumbra
The portion of a shadow in which only part of the light source is covered by an opaque body.
penumbral lunar eclipse
A lunar eclipse in which the Moon passes only through the Earth's penumbra.

penumbra
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.

Penumbra
A Partial blocking of the Sun by the Earth creates an Penumbra Shadow. The Sunlight is dimmed but not extinguished.
Penumbra Eclipse ...

Penumbra
the area of partial illumination surrounding the darkest part of a shadow caused by an eclipse.
Periapsis
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 ...

- Penumbral Eclipse. Observers in western North America can see the Moon pass partly through the edge of Earth's shadow on Feb. 9. The northern part of the Moon will appear darkest.
The Planets ...

Penumbra
Part of the largest sunspot in Active Region 10030 recorded on 15 July 2002 with the Swedish 1-m Solar Telescope on La Palma.

PENUMBRA:
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.

Penumbral lunar eclipse
Europe, e Africa, Asia, Aus., Pacific, N.A.
Partial lunar eclipse ...

PENUMBRA
The penumbra is the area of partial shadow (compare to umbra).

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.

penumbra
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.
perigee ...

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]
Apsidal Motion
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.
Annular Solar Eclipse : 29 April
Annular Eclipse Visibility:
Antarctica ...

Last Penumbral
March 29, 2526
All Saros Series follow this progression.

Last penumbral
(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 See umbra. penumbral eclipse See lunar eclipse, note. Per, Pers International Astronomical Union abbreviations for Perseus. See constellation.

penumbra portion of the shadow from which part of the light source is excluded when a body passes over the light source.

penumbra region of partial shadow that is outside the umbra; the light source is partially blocked.

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.

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.

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 ...

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.

Like all shadows of light from an extended source the shadow produced by the Earth has an umbra, where all the light from the Sun is shadowed, and a penumbra, where only some of it is.

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.

The answer to your question is no: it is impossible for two umbral lunar eclipses to occur in one month, and marginally possible for two penumbral eclipses to occur (which you would have to look hard to find).

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 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 generally found in groups, but not always. You could find a small isolated sunspot. Most large sunspots are surrounded of smaller ones, and sometimes you could see a few sunspots in the penumbra (the shaded regions).

See also: See also: Earth, Solar, Sun, Astro, Umbra

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