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Essay / Research Paper Abstract
This 4 page report discusses the most basic aspects of the astronomical phenomenon known as a lunar eclipse. How and why an eclipse occurs is briefly outlined and the difference between a total and partial eclipse is explained. Bibliography lists 4 sources.
Page Count:
4 pages (~225 words per page)
File: D0_BWlunar.rtf
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Unformatted sample text from the term paper:
the gods, a warning of impending doom, or a sign of great blessing depended on who and where they were located (and at what actual point in history). The student
researching lunar eclipses should understand that because such events are relatively rare, they still hold a special fascination, even in the relatively enlightened world of the 21st century. And yet, the
reasons behind how and why they take place are generally not known by the average person. Yes, that average Joe may understand that the way the moon, Earth, and sun
line up causes a shadow to pass across the face of the moon but why does it happen? And why doesnt happen more often? These are the sorts of questions
the student will want to answer for his or her readers in their report. The "Mechanics" of a Lunar Eclipse To explain the phenomenon in the most simplistic
of terms, an encyclopedic reference will read: "A lunar eclipse occurs when the earth is between the sun and the moon and its shadow darkens the moon" (Encarta). That is
already understood. The actual reason for the event occurring is related to the shape of the shadow cast by the Earth because of the sun and at what point light
is completely obscured. Referring again to Encarta and the article on eclipses contributed by Hess (1994) the explanation is that Earths shadow is long and conical and that:
"Surrounding the shadow cone, also called the umbra, is an area of partial shadow called the penumbra. The approximate mean length of the umbra is 857,000 miles; at a distance
of 239,000 miles, the mean distance of the moon from the earth, it has a diameter of about 5700 miles" (PG). Ryback
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