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Eclipses are astronomical events where celestial bodies like the Sun, Earth, and Moon align, causing shadows with regions named umbra, penumbra, and antumbra. These shadows lead to different types of eclipses: total, annular, and partial, each offering a unique viewing experience. The text delves into the progression of an eclipse, the calculation of the umbra's length, and the movement of an eclipse's shadow across Earth.
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Eclipses occur when one celestial body moves into the shadow of another
Umbra, Penumbra, and Antumbra
The shadow created during an eclipse consists of three parts: the umbra, penumbra, and antumbra
Eclipses can be classified as total, annular, or partial, depending on an observer's position relative to the shadow regions
An eclipse unfolds through specific phases, each defined by contact points
An eclipse progresses through four key contact points: initial, second, third, and final
The length of the umbra can be calculated using geometric principles, considering the sizes and distances of the celestial bodies involved
The speed at which an eclipse's shadow moves over the Earth's surface can vary and is affected by the shadow's location and angle of intersection with the Earth's surface
The rotation of the Earth and the orbital motion of the Moon allow for the precise forecasting of eclipse paths, enabling observers to plan for viewing opportunities
During a lunar eclipse, the Earth's atmosphere can refract sunlight into the umbra, causing the Moon to appear red, also known as a "blood moon."
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Celestial bodies involved in an eclipse
Eclipses occur with at least three celestial bodies, such as Sun, Earth, Moon.
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Eclipse duration and type factors
Depend on alignment, relative motion of celestial bodies.
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During an eclipse, the innermost part that is completely shaded is called the ______.
umbra
