By Dinah L. Moche
Discover the wonders of the evening sky with this bestselling astronomy guide
For a iteration, Astronomy: A Self-Teaching Guide has brought millions of readers world wide to the evening sky. Now this vintage beginner's advisor has been thoroughly revised to carry it brand new with the newest discoveries and portraits. * beneficial properties over eighty new images and illustrations, together with a full-color insert
* stories the latest telescopes and spacecraft
* contains an summary of the easiest astronomy internet sites
* Written through award-winning writer Dinah Moch?
Packed with important tables, charts, and famous person and moon maps, this simple consultant makes it effortless that you can fast grab the fundamental rules of astronomy and begin staring at the evening sky. The booklet comprises ambitions, stories, and self-tests, and will be used by itself as a self-teaching advisor or as a complement to astronomy path fabrics.
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Additional info for Astronomy: A Self-Teaching Guide (Wiley Self-Teaching Guides)
5-mm (1⁄2-inch) focal length is used? __________ (b) How could you increase the magnifying power of this telescope? __________ Answer: (a) 96×. 5 mm (b) Use an eyepiece of a shorter focal length.
This slow motion of Earth’s axis, caused UNDERSTANDING THE STARRY SKY mainly by the tug of the gravity of the Sun and Moon on Earth’s equatorial bulge, is called precession. 5° to its orbital plane, so precession causes the north celestial pole to circle among the stars. 14). The vernal equinox, the zero point of right ascension, drifts westward around the ecliptic at a rate of about 50 seconds a year. It drifts 30°, a whole zodiac constellation, in 2150 years. Then all star charts are out of date.
___________________________________________________ ____________________________________________________________________ 8. Where on Earth would you have to be to have the Sun pass directly across your zenith at the time of the (a) vernal equinox? ________________________ (b) summer solstice? __________ (c) winter solstice? ______________________ 9. M. tonight, at approximately what time will it rise a month from now? __________________________________________________________ 10. Why is a solar day about 4 minutes longer than a sidereal day?