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Eclipse

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Eclipse</h2>
A Presentation to Astronomy Ireland<br />By: David Grennan, 27th February 2006<br />
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Solar Eclipses - Past, Present, and Future.</h2>
Eclipse Mythology<br />Chinese, Hindu, Egyptian, Impact on modern day<br />science and religion.<br />Mechanics of Solar Eclipses<br />Why eclipses occur.<br />Types of Eclipse.<br />Phases of an eclipse.<br />Shadows <br />Bailys Beads.<br />Diamond Ring.<br />Temperature<br />Corona.<br />Prominences.<br />
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Solar Eclipses - Past, Present, and Future.</h2>
Safely Viewing Eclipses<br />Eclipse, March 29, 2006 a guide.<br />Using computer simulations<br />Eclipse from Ireland.<br />Eclipse from Turkey.<br />Eclipse from Space<br />Future Eclipses<br />Important Eclipses present – 2030<br />The 'almost' total eclipse of 2015 from Ireland.<br />
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Eclipse Lore and Mythology</h2>
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"Nothing there is beyond hope, nothing that can be sworn impossible,<br />nothing wonderful, since Zeus, father of the Olympians,<br />made night from mid-day, hiding the light of the shining Sun,<br />and sore fear came upon men." Archilochus (c.710 - 676 BC)<br />
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Eclipse Lore and Mythology</h2>
Our ancestors saw eclipses as evil omens, often as portents<br />
of some catastrophic event or a sign from their deities.<br />The earliest recorded eclipse was in China on <br />October 22, 2134 BC.  The two court astrologers to the<br />Emporer lost their heads because, they had failed to predict it<br />The Babylonians were the first to calculate the regular<br />intervals at which eclipses occur.<br />Thales of Miletus predicted a solar eclipse that marked<br />the beginning of the Greek scientific/philosophic era.<br />
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Eclipse Lore and Mythology</h2>
Word eclipse comes from a Greek word, “ekleipsis”<br />meaning abandonment.<br />There is a story that suggests Christopher Columbus used his<br />Knowledge of an upcoming lunar eclipse to great effect.<br />
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Ancient China</h2>
People of ancient China were convinced that eclipses<br />Occurred because a great dragon (or toad, or dog) was<br />Devouring the Sun.<br />They made load noises, banged implements etc to scare<br />Away the dragon.<br />As total eclipses can only last a maximum of 7 ½ minutes<br />There raucous behaviour always had the desired effect.<br />
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Ancient China</h2>
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Han Dynasty (206 BC - 220 AD)<br />
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Hindu Folklore</h2>
According to Hindu mythology, the eclipse represents<br />the demons Rahu and Keta locked in celestial combat and<br />eating the Sun. <br />
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Hindu Folklore</h2>
The Gods were drinking the elixir of immortality.<br />The demon Rahu slipped into their midst and stole a sip.<br />Surya (the sun) and Soma (the moon) reported the incident<br />to the great deity Vishnu.<br />Vishnu promptly sought out the impudent Rahu<br />and lopped off his head.<br />But having become deathless, Rahu survived and to this day<br />seeks revenge on the tattletales by devouring them.<br />
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Ancient Egypt</h2>
The egyptian word for eclipse is ‘Akhet’<br />King Akhenaten (1356-1338 BC) built his capital according<br />to the totality path of the solar eclipse of 08/15/-1351.<br />The Pharaoh named his new residence 'Akhet Aten'.<br />The name of the city means: 'The Eclipse of Aten'.<br />The name of the Giza Sphinx was 'Hor in the Akhet‘<br />Many different ancient egyptian sun cults saw eclipses<br />Differently.  Many refer to a serpent eating the Sun God.<br />Most however refer to a great hawk stealing RA’s glory.<br />
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Eclipses and Religion</h2>
Many hindus to this day immerse themselves in holy rivers<br />And lakes during solar eclipses.<br />Working during eclipses is considered bad luck.<br />Muslim tradition holds that the prophet Mohammed,<br />the founder of Islam, prayed for the duration of an eclipse.<br />Senior muslim clerics issued an edict forbidding people to<br />look at the Sun directly because it transgresses Islamic law<br />to harm oneself.<br />Druids believe eclipse represents man and woman together.<br />
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Eclipses and Religion</h2>
Luke 23:44-48 “And it was about the sixth hour, and there<br />was a darkness over all the earth until the ninth hour.  And the sun was darkened, and the veil of the temple<br />was rent in the midstSome suggest a solar eclipse as an explaination for<br />The ‘darkness’ however the facts don’t lend credance.<br />
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Mechanics of Solar Eclipses</h2>
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Solar eclipse of<br />11 Aug 1999<br />From MIR<br />Spacestation.<br />
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Mechanics of Solar Eclipses</h2>
Todo insert flash file.<br />
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Total Eclipse</h2>
Although a total eclipse refers to a specific event, the events leading<br />Up to ‘totality’ and following it also hold much interest.<br />Partial Phase<br />Shadows<br />Bailys Beads<br />Diamond Ring<br />
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TotalityPartial Phase</h2>
During the partial phase there are many interesting things to note.<br />First Contact.<br />Eclipse increasing in magnitude.<br />Temperature.<br />Increasing Darkness<br />Shadow Bands<br />Crescent Shadows<br />Creatures settling believing night is imminent<br />Moons shadow racing from the west(ish).<br />Bailys Beads<br />Diamond Ring<br />
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First Contact.</h2>
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The moment when the western limb of the Moon contacts the<br />Eastern limb of the Sun.<br />First contact is not directly<br />Visible, however very shortly<br />Afterwards a little ‘bite’ is<br />Taken from the Sun.<br />
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 </h2>
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Increasing Darkness </h2>
With the decrease in the area of Sun presented to us<br />Ambient light levels fall.<br />Most noticeable in the latter stages of the eclipse.<br />Video from west Africa showing this dramatically.<br />
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Shadow Bands</h2>
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Caused by distortions in the Earth’s atmosphere and the partially<br />Eclipsed Sun.<br />Best seen on a pale coloured<br />Wall or concrete pavement.<br />
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Crescent Shadows</h2>
Note shadows cast by irregularly shaped objects such as leaves<br />From trees.<br />
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The Hybrid Eclipse.</h2>
The official explaination!<br />“A hybrid eclipse is a unique type of central eclipse where parts<br />of the path are annular while other parts are total.<br />This duality comes about when the vertex of the Moon's umbral<br />shadow pierces Earth's surface at some points, but falls short<br />of the planet along other portions of the eclipse path.<br />The curvature of Earth's surface brings some geographic locations<br />along the path into the umbra while other positions are more distant<br />and enter the antumbral rather than umbral shadow.”<br />
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The Hybrid Eclipse.</h2>
In practice!<br />
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Eclipse Safety</h2>
Directly looking at the Sun,<br />even for a short time,<br />CAN PERMANENTLY<br />DAMAGE YOU EYESIGHT<br /><br />
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Eclipse

Eclipse A Presentation to Astronomy Ireland By: David Grennan, 27th February 2006 Solar Eclipses - Past, Present, and Future. Eclipse M...

What are Earthquakes

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What are Earthquakes?</h2>
The shaking or trembling caused by the sudden release of energy<br />Usually associated with faulting or breaking of rocks<br />Continuing adjustment of position results in aftershocks<br />
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What is the Elastic Rebound Theory?</h2>
Explains how energy is stored in rocks<br />Rocks bend until the strength of the rock is exceeded<br />Rupture occurs and the rocks quickly rebound to an undeformed shape<br />Energy is released in waves that radiate outward from the fault<br />
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The Focus and Epicenter of an Earthquake</h2>
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The point within Earth where faulting begins is the focus, or hypocenter<br />The point directly above the focus on the surface is the epicenter<br />
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Seismographs record earthquake events</h2>
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 At convergent boundaries, focal depth increases along a dipping seismic zone called a Benioff zone<br />
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Where Do Earthquakes Occur and How Often?</h2>
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~80% of all earthquakes occur in the circum-Pacific belt<br />most of these result from convergent margin activity<br />~15% occur in the Mediterranean-Asiatic belt<br />remaining 5% occur in the interiors of plates and on spreading ridge centers<br />more than 150,000 quakes strong enough to be felt are recorded each year<br />
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The Economics and Societal Impacts of EQs</h2>
Building collapse<br />Fire<br /> Tsunami<br />Ground failure<br />
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What are Seismic Waves?</h2>
Response of material to the arrival of energy fronts released by rupture<br />Two types:<br /> Body waves<br />P and S<br />Surface waves<br />R and L<br />
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Body Waves: P and S waves</h2>
Body waves<br />P or primary waves<br />fastest waves<br />travel through solids, liquids, or gases<br />compressional wave, material movement is in the same direction as wave movement<br />S or secondary waves<br />slower than P waves<br />travel through solids only<br />shear waves - move material perpendicular to wave movement<br />
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Surface Waves: R and L waves</h2>
Surface Waves<br />Travel just below or along the ground’s surface<br />Slower than body waves; rolling and side-to-side movement<br />Especially damaging to buildings<br />
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How is an Earthquake’s Epicenter Located?</h2>
     Seismic wave behavior<br />P waves arrive first, then S waves, then L and R<br />Average speeds for all these waves is known<br />
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After an earthquake, the difference in arrival times at a seismograph station can be used to calculate the distance from the seismograph to the epicenter.<br />
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How is an Earthquake’s Epicenter Located?</h2>
Time-distance graph showing the average travel times for P- and S-waves. The farther away a seismograph is from the focus of an earthquake, the longer the interval between the arrivals of the P- and S- waves<br />
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How is an Earthquake’s Epicenter Located?</h2>
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Three seismograph stations are needed to locate the epicenter of an earthquake<br />A circle where the radius equals the distance to the epicenter is drawn<br />The intersection of the circles locates the epicenter <br />
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How are the Size and Strength of an Earthquake Measured?</h2>
subjective measure of the kind of damage done and people’s reactions to it<br />isoseismal lines identify areas of equal intensity<br />Modified Mercalli Intensity Map<br />1994 Northridge, CA earthquake, magnitude 6.7<br />
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How are the Size and Strength of an Earthquake Measured?</h2>
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Magnitude<br />Richter scale measures total amount of energy released by an earthquake; independent of intensity<br />Amplitude of the largest wave produced by an event is corrected for distance and assigned a value on an open-ended logarithmic scale<br />
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What are the Destructive Effects of Earthquakes?</h2>
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Ground Shaking<br />amplitude, duration, and damage increases in poorly consolidated rocks<br />
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Can Earthquakes be Predicted?</h2>
Earthquake Precursors <br />changes in elevation or tilting of land surface, fluctuations in groundwater levels, magnetic field, electrical resistance of the ground<br />seismic dilatancy model<br />seismic gaps<br />
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Can Earthquakes be Predicted?</h2>
Earthquake Prediction Programs<br />include laboratory and field studies of rocks before, during, and after earthquakes<br />monitor activity along major faults<br />produce risk assessments<br />
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Can Earthquakes be Controlled?</h2>
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Graph showing the relationship between the amount of waste injected into wells per month and the average number of Denver earthquakes per month<br />Some have suggested that pumping fluids into seismic gaps will cause small earthquakes while preventing large ones<br /><br />
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What are Earthquakes

What are Earthquakes? The shaking or trembling caused by the sudden release of energy Usually associated with faulting or breaking of rock...

Eclipse

What are Earthquakes

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