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Eclipses, Occultations and Transits
An eclipse is the result of the total or partial masking of a celestial body by another along an observer's line of sight. Solar eclipses result from the Moon blocking the Sun relative to the Earth; thus Earth, Moon and Sun all lie on a line.

Eclipse Glasses Sold Out in Advance of Sunday's Solar Eclipse
Eclipse glasses at Amazon are currently unavailble as of Friday evening, May 18, 2012.
Credit: SPACE.com via Amazon
View full size image ...

Eclipse, the Java IDE
Until about the end of 2001, Visual Age for Java was IBM's strategic Java product. VAJ is one of several Java development IDEs, somewhat unique in that it stores the source code in a repository and lets the user work on packages, classes and methods rather than source files.

altitude -- the angle (in degrees) above the level horizon where an object in the sky appears. (The object's azimuth is also needed to pinpoint its position.) ...

Eclipses and Greenwich
Sir George Biddell Airy (1801-92), by Thomas Herbert Maguire [artist]; George Ransome [printer]; M & N Hanhart [printers], 1852 ...

Eclipses reveal first images of Sun's iron emission
Posted: 05 January 2010 ...

Eclipses In The News ...
Total Solar Eclipse Today Was Record Blackout at 6 minutes and 39 seconds
National Geographic - July 22, 2009
Metaphysics ...

eclipse at HighBeam Research
eclipse on Wikipedia
eclipse. (Image by Lviatour, GFDL) ...

Saturn eclipses an icy moon
The mighty planet Saturn is circled by a fleet of moons, each as different from the other as individual people. And as weird and alien as it seems, this Saturnian system of planet and moons have some similarities to our own Earth and Moon.

A celestial alignment in which two bodies lie on a line passing through the position of the observer. Eclipses may also occur involving when the shadow of the closer body occults the farther body. can occur only at , which occur on ...

Are there eclipses on other planets? (Intermediate)
Can a lunar and a solar eclipse happen in the same month? When will this happen next? (Intermediate)
Was Stonehenge built to mark solar phenomena? (Intermediate) ...

Wikipedia, the free encyclopedia - Cite This Source
An eclipse (Ancient Greek noun έκ"ειψις (kleipsis), from verb εκ"είπω (eklepō), "I vanish," a combination of prefix εκ- (ek-), from preposition εκ, εξ (ek, ex), "out, ...

Eclipses of the Sun
Sometimes, the Moon passes between the Earth and the Sun. The Moon blocks the light of the Sun and a shadow of the Moon is cast on the Earth's surface. This is an eclipse of the Sun, or a solar eclipse.

Eclipse day on Lion Hill near Lake Nakuru, Kenya
Elephants on the Masai Mara
Baboons on the Masai Mara ...

The Eclipse at a Glance North America Other Event Time
EDT Time
CDT Time
MDT Time
PDT Time
Partial Eclipse Begins: ...

Solar Eclipses
A solar eclipse occurs when the new Moon passes between the Sun and the Earth, casting a shadow on the Earth. There are three types of solar eclipses: annular, partial, and total.

Solar eclipse
From Wikipedia, the free encyclopedia
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Solar eclipse (not to scale)
As noted above, the images that we show in discussing eclipses are illustrative but not drawn to scale. The true relative sizes of the Sun and Earth and Moon, and their distances, are very different than in the above figure.
Animations of Solar Eclipses ...

Stereo Eclipse
March 12, 2007: When scientists announce they're about to calibrate their instruments, science writers normally put away their pens. It's hard to write a good story about calibration. This may be the exception: ...

Eclipse: An astronomical event that occurs when one celestial object moves into the shadow of another.
Transit: Event that occurs when one celestial body appears to move across the face of another celestial body, as seen by an observer at some particular vantage point.

Eclipses were, to the ancients, perhaps the most striking, important event in the heavens. Ritual and ceremony were practiced worldwide at the time of eclipses, and many astrologers were executed for failing to predict eclipses.

Eclipses visible from Iowa are in bold
Time of Mideclipse (GMT)
Iowa Time in Italics ...

Eclipses are more spectacular because our Moon, which has a diameter 400 times smaller than our Sun, lies almost exactly 400 times closer.

Mid eclipse, or the eclipse's deepest moment, comes at 11:40 p.m. Even at this dark hour, the northern (top) part of the Moon will likely look lighter than the southern (bottom) part, which passes more closely to, though above, the center of the Earth's shadow. (See map.)* ...

Eclipses & Occultations, Orbits & Loops, Planetary Alignments, Tides & Quakes, Time & Motion ...

Solar Eclipse
The sun is beginning to move out from behind the moon in this picture of a total eclipse. Image Credit: NASA
During a solar eclipse, the moon comes between the sun and Earth so that all or part of the sun's light is blocked from Earth.

Lunar Eclipses
A lunar eclipse occurs during a Full Moon when the Earth is between the Sun and the Moon and when the Moon passes through some of the Earth's shadow..
Where Visible ...

Why Do Eclipses Happen? What Is an Eclipse?
Grade Level: 3-5, 6-8
Lesson Time: Less Than 30 Minutes
Body: Sun, Earth, Earth's Moon
Mission: Apollo Program (Earth's Moon), Earth Science Missions (Earth), Heliophysics Missions (Sun) ...

A lunar eclipse occurs when the Earth's shadow falls on the moon. Lunar eclipses occur, on average, about every 6 months.
Types of Lunar Eclipses ...

Martian Solar Eclipses
The shadow of the Martian moon, Phobos, is captured here by the Mars Global Surveyor wide angle camera. Frequent solar eclipses are caused by the passage of Phobos between Mars and the Sun.

Total Solar Eclipse
Taken at 3:01pm 21/06/01 Chinyingi, Zambia with an Elite 200, Meade 2045D 1 sec.

The longest solar eclipses occur when the Earth is at aphelion (farthest from the Sun, making the solar disc smaller) and the Moon is at perigee (closest to the Earth, making the Moons apparent diameter larger).

From time to time"but only at new or full Moon"the Sun and the Moon line up precisely as seen from Earth, and we observe the spectacular phenomenon known as an eclipse.

Eclipse Web Sites
The following sites are probably the best and most complete ones on the web. You'll find eclipse predictions, photographs, observing instructions, and fairly complete indexes of all high-quality eclipse sites on the web.

ECLIPSE - Obscuring of one celestial body by another, either by direct superposition or by the casting of a shadow. Solar eclipses are of three kinds, total (when the Moon completely eclipses the Sun), annular (when a complete ring of sunlight escapes around the edge of the Sun), and partial.

(a) Occultation of one celestial body by another which passes between it and the observer. The Solar eclipse is caused by the passing of the Moon between the Sun and the Earth in this way; such an eclipse may be complete (total) or incomplete (partial).

Eclipse. Eclipses occur when the Sun, Moon, and Earth precisely line up. The Moon, in its orbit around the Earth, is inclined at about 5 degrees to the ecliptic (the plane at which the Earth orbits the Sun). Therefore the Moon spends most of its time above or below the ecliptic plane.

The passage of one object in front of another (as the Moon passes in front of the Sun during an eclipse of the Sun), or the passage of one object through the shadow of another (as the Moon passes through the shadow of Earth during an eclipse of the Moon).

Eclipse An alignment of two bodies with the observer such that either the nearer body prevents the light from the further body from reaching the observer (strictly speaking, these are occultations), e.g.

Eclipse- when one celestial body passes in front of another, dimming or obscuring its light (e.g. solar, lunar, and eclipsing binaries)
Ecliptic- the apparent yearly path of the sun against the stars ...

The event in which one celestial body passes in front of another, blocking the light from the more distant object. An eclipse can refer to the Moon passing in front of the Sun, but can also be applied to a star in a binary system which passes in front of the other star.

When one object passes in front of another as seen from the Earth. The term is usually used when the two objects are of roughly the same angular size, as in an eclipse of the Sun by the Moon.

The cutting off, or blocking, of light from one celestial body by another.
The plane of Earth's orbit about the Sun ...

The cutting off of part or all the light from one celestial object by another.
eclipsing binaries
Binary star systems in which, as seen from Earth, the stars periodically pass in front of each other.

the total or partial blocking of one celestial body by another.

Eclipse Year
The 346.62 days it takes the sun to return to a node
Eclipsing Binary ...

Eclipse, solar. The passage of the Moon in front of the Sun so that the Moon is directly in front of the Sun. Totality may last for a little over 7 minutes under favourable conditions. Partial eclipses occur when the Sun is incompletely covered.

eclipse season: That period when the sun is near a node of the moon's orbit and eclipses are possible.
eclipse year: The time the sun takes to circle the sky and return to a node of the moon's orbit; 346.62 days.

Eclipse Track - The path of the Moon's shadow across the Earth during a solar eclipse
Eclipse Year - The interval of time (346.6 days) from one passage of the Sun through a node of the Moon's orbit to the next passage through the same node ...

Total or partial masking of a celestial body by another along the line of sight. Solar eclipses result from the Moon blocking the Sun relative to the Earth; thus Earth, Moon and Sun all lie on a line.

"Eclipse" is the tenth and final track from United Kingdom progressive rock band Pink Floyd's 1973 in music album, The Dark Side of the Moon....
". Video is not available of this event, but a link to audio is present below. Adams chose the name for Pink Floyd's 1994 album, The Division Bell ...

The Eclipse
In a total eclipse of the Sun, the Moon just barely covers the Sun. The Sun itself is so distant that when viewed from anywhere on Earth, it covers practically the same patch of the sky, with a width of about 0.5.

This Eclipse is History
A NASA scientist views the eclipse from the foothills of Transylvania, home of ancient legends and modern science. Includes video replays from NASA TV and an audio account of the eclipse as seen from Romania.
Snagging a High Fly Ball ...

Lunar Eclipse
An eclipse of the Moon can only occur at FULL MOON and only if the Moon passes through some portion of the Earth's shadow (see diagram 2 under phases of the Moon).
A TOTAL eclipse happens when the entire Moon passes through Earth's umbral shadow (see diagram below).

Solar Eclipse
The passing of the moon between the Sun and Earth. In a total solar Eclipse the moon blocks out the light from the solar disk, allowing us to see the solar corona more clearly. Coronagraphs essentially create artificial eclipses so that the corona can be studied continually.

lunar eclipse (27) The darkening of the moon when it moves through Earth's shadow.
Lyman series (l"'m-n) (87) Spectral lines in the ultraviolet spectrum of hydrogen produced by transitions whose lowest energy level is the ground state.

Toward Eclipse Mapping of Hot Jupiters
ApJ., 664, 1199
paper ...

Annular eclipse - a type of solar eclipse in which a ring (annulus) of sunlight remains visible.
Asteroid - a "minor planet" ,a chunk of rock smaller than planet-size but larger than a meteoroid, in orbit around a star.

The blocking of some or all of the light from one object by another. This eclipse image is courtesy of NASA DFRC.

Eclipses (Part 1) (Check the study guide for this lesson)
Eclipses are a very important part of astronomy. To understand them you have to learn the fundamentals of the geometry of orbits and the physics of shadows. That's what this lesson will teach you.

eclipse Event during which one body passes in front of another, so that the light from the occulted body is blocked.
eclipsing binary Rare binary-star system that is aligned in such a way from Earth we observe one star pass in front of the other, eclipsing the other star.

Eclipses and Mutual Events (supplement), by Arlot and Thuillot
Satellite Photometry, by D. Tholen
Visual Imaging, by S. Larson ...

An eclipse happens when the moon blocks the Sun or the Earth's shadow falls on the moon.
Some Eclipsing Binaries Magnitude Range Period
Delta Librae ...

When our view of one object in the sky is blocked by either another object, or the Earths shadow.
Ecliptic ...

eclipse Passage of one body through the shadow cast by another. A lunar eclipse, where the Moon passes through Earth's shadow, is a good example.

eclipse - (n.)
The hiding of one celestial body by another. The hiding of a star by a body of larger angular size is usually called an occultation.
ecliptic - (n.) ...

An eclipse in which the Moon passes through the shadow cast by the Earth.

Solar eclipses can only occur within a few days of the New Moon, but they do not happen at every New Moon. This is due to the 5.1 degree tilt of the Moon's orbit around the Earth compared to the Earth's orbit around the Sun.

Solar Eclipse
A phenomenon in which the Moon's disk passes in front of the Sun, blocking sunlight. A total eclipse occurs when the Moon completely obscures the Sun's disk, leaving only the solar corona visible. A solar eclipse can only occur during a new phase of the Moon.
Triton ...

Solar Eclipse
A phenomenon that occurs when the Earth passes into the shadow of the Moon. A total solar eclipse occurs when the Moon is close enough to completely block the Sun's light. An annular solar eclipse occurs when the Moon is farther away and is not able to completely block the light.

A solar eclipse occurs when a new moon passes between the Sun and Earth, and are usually defined as either total, partial, or annular. These natural phenomenona take place on average twice each year, but with the rarer total solar eclipses happening about once every 1.5 years.

During an eclipse, about 25% of the diameter of one star is covered by the other, and the brightness of the pair of stars decreases by about 0.09 magnitudes.

K. A lunar eclipse is the opposite of a solar eclipse. Instead of the moon moving between the earth and the sun (a solar eclipse) casting its shadow on earth, the earth comes between the sun and the moon casting its shadow over the moon.

A secondary eclipse occurs when the primary component occults the dimmer star. Algol is a prototype for a class of stars known as Algol variables.
Algol A belongs to the spectral class B8V, Algol B to K0IV, and Algol C to A5V.

annular eclipse An eclipse in which a thin ring of the source of light appears around the obscuring body. anode The positive pole or electrode of any electron emitter, such as an electron tube or an electric cell.
The negative pole or electrode is called a cathode.

eclipse (NASA Thesaurus / NASA SP-7, 1965) 1. The reduction in visibility or disappearance of a nonluminous body by passing into the shadow cast by another nonluminous body.

Twice-yearly eclipses:
The amount of time for a total eclipse of the sun by the far side of the ring is given by:
t = ω/(2rΩsinθ)
ω = the width of the Orbital
r = the radius of the Orbital
Ω = angular velocity of the Orbital about the star ...

LUNAR ECLIPSE: A phenomenon that occurs when the Moon passes into the shadow of the Earth. A partial lunar eclipse occurs when the Moon passes into the penumbra, or partial shadow. In a total lunar eclipse, the Moon passes into the Earth's umbra, or total shadow.

partial eclipse Pauli exclusion principle peculiar galaxy abnormally shaped galaxy that emits nonthermal radiation. penumbra portion of the shadow from which part of the light source is excluded when a body passes over the light source.

annular eclipse An annular eclipse occurs when the Sun and Moon are exactly in line, but the apparent size of the Moon is smaller than that of the Sun.

eclipse The cutting off of light from one celestial body by another. ecliptic The plane of Earth's orbit about the Sun effusive eruption A relative quiet volcanic eruption which puts out basaltic lava that moves at about the speed one walks. The lava is fluid in nature.

The chromosphere is the source of the strongest lines in the solar spectrum, including the Balmer alpha line of hydrogen and the H and K lines of calcium, and is the source of the red (chromium) color often seen around the rim of the moon at total solar eclipses. Ci index.

Annual Eclipse
A type of total eclipse in which the moon is too far from the earth to totally cover the suns surface. A ring of the photosphere surrounds the moon during mideclipse. The corona is not visible and neither are the prominence because of the glare from the photosphere.
Anorthosite ...

It is visible to the naked eye during a solar eclipse. Coronagraph Telescope for observing the corona. Often contains an occulting disk which covers the disk of the Sun so that the corona may be more easily observed. CDS Coronal Diagnostic Spectrometer.

The resultant light curve shows primary eclipses when the dimmer star passes in front of the brighter star and a scondary eclipse or minimum when the brighter star eclipses the dimmer star. The component stars in an eclipsing binary are generally close to each other.

F CORONA Of the white-light CORONA (that is, the corona seen by the eye at a total solar eclipse), that portion which is caused by sunlight scattered or reflected by solid particles (dust) in interplanetary space. F REGION (Also F LAYER).

It is visible to the naked eye during a solar eclipse.
Density The amount of mass or number of particles per unit volume. In cgs units mass density has units of gm cm-3. Number density has units cm-3 (particles per cubic centimeter).

2136 BC - Chinese astronomers record a solar eclipse
586 BC - Thales of Miletus predicts a solar eclipse
350 BC - Aristotle argues for a spherical Earth using lunar eclipses and other observations ...

5 years these two stars revolve and eclipse each other. Without additional help the variation in brightness cannot be seen because it is just about a few tenth of a mag.

95026 days they eclipse each other, the main eclipse yielding a dip of about 0.2 magnitudes.

8 mag as the brighter component is then eclipsed by the darker companion. This eclipse lasts a full year (the last eclipse took place in 1983). Caculations show that the dark component of epsilon Aur has about 10 -12 solar masses.

This is called a solar eclipse; if the alignment is slighly imperfect then the Moon covers only part of the Sun's disk and the event is called a partial eclipse. When it lines up perfectly the entire solar disk is blocked and it is called a total eclipse of the Sun.

Although the Sun's corona has been observed during total eclipses of the Sun for thousands of years, the existence of coronal mass ejections was unrealized until the space age.

Astronomers have also observed that planet b is eclipsed by its star by about two minutes (120 +/- 24 seconds) later than would be expected if it has a perfectly circular orbit.

Hipparchus followed the method used by Aristarchus, a procedure that depends upon measuring the breadth of the Earth's shadow at the distance of the Moon (the measurement being made by timing the transit of the shadow across the Moon's disk during a lunar eclipse).

A coronograph creates an artificial eclipse by covering the bright disk of the sun allowing study of the corona. Periodically, a huge cloud of gas with frozen-in magnetic field lines is ejected from the Sun over several hours. These clouds are called coronal mass ejections or CME's.

In this case, one star may periodically pass in front of the other, blocking light from the eclipsed star. Such a system is called an eclipsing binary and is recognized by regular variations in the amount of light received at the telescope (1).

August 21 - Total Solar Eclipse. This is a rare, once-in-a-lifetime event for viewers in the United States. The last total solar eclipse visible in the United States occurred in 1979 and the next one will not take place until 2024.

Finally the outermost layer of the Sun is the corona, a region of diffuse glowing gas which can only be seen from Earth when the much brighter glare from the Sun is blocked by a solar eclipse.

See also: See also: What is the meaning of Astro, Earth, Solar, Sun, Planet?

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