Download The Complete Idiot's Guide to Astronomy, 2nd edition, 2001 by Christopher G. De Pree, Alan Axelrod PDF

By Christopher G. De Pree, Alan Axelrod

Patron consultant to trendy astronomy, with steps for taking on astronomy as a pastime, or heavily. provides advice for getting and utilizing state-of-the-art telescopes, and publications for exploring the skies. comprises information regarding the overseas area Station. Softcover.

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725, many smaller gnomons—what might be called field stations—were set up along a single line of longitude extending some 2,200 miles from the principal gnomon at Yang-chhêng. With this system, the Chinese could calculate calendars with considerable precision. E. 1276. Star Words A gnomon is any object designed to project a shadow used as an indicator. The upright part of a sundial is a gnomon. Why this passion to measure the heavens and the passage of time? Living in harmony with nature has always been important in Chinese philosophies, and, in terms of practical politics, exact knowledge of the heavens aided rulers in establishing and maintaining their absolute authority.

It is akin to lines of latitude on the earth. Astronomer’s Notebook Declination is analogous to Earthly latitude. The declination of a star seen directly above the earth’s equator would also be at the celestial equator—that is, 0 degrees. A star at the north celestial pole (that is, directly over the earth’s North Pole) would be +90 degrees. At the south celestial pole, it would be -90 degrees. In the latitudes of the United States, stars directly overhead have declinations in the +30- to +40-degree ranges.

Fall Constellations In the fall, the constellation Pegasus, winged horse of Greek mythology, is easy to locate. If you find it hard to imagine connecting the stars to trace out the horse, look for the highly recognizable asterism associated with Pegasus called the Great Square. M. in early October, it should be directly above you. The four stars marking out its four corners aren’t terribly bright, but the other stars in that area of the sky are fairly dim, so the figure should stand out clearly.

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