By Michael A. Seeds, Dana Backman
With their best-selling astronomy textbook, HORIZONS, authors Mike Seeds and Dana Backman assist you comprehend your house within the universe-not simply your place in house, yet your position within the unfolding heritage of the actual universe. to accomplish this target, they makes a speciality of significant questions: «What Are We?,» which highlights your house as a planet dweller in an evolving universe, guiding you to higher comprehend the place we got here from and the way we shaped, and «How can we Know?,» which gives insights into how the method of technological know-how can train us extra approximately what we're.
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Extra info for Horizons: Exploring the Universe, 11th Edition
From the southern horizon down to the south celestial pole? Learning to Look 1. Find Sagittarius and Scorpius in the photograph that opens this chapter. 2. The stamp at right shows the constellation Orion. Explain why this looks odd to residents of the northern hemisphere. 3 Cycles of the Sky Enhanced visual image Guidepost In the previous chapter you looked at the sky and saw how its motion is produced by the daily rotation of Earth. In this chapter, you will discover that the sun, moon, and planets move against the background of stars.
Alpha Centauri is a special star, and you will have to These numbers are known as apparent visual magnitudes travel as far south as southern Florida to glimpse it above the (mV), and they describe how the stars look to human eyes observsouthern horizon. ing from Earth. Although some stars emit large amounts of inNaming stars is helpful, but to discuss the sky with precifrared or ultraviolet light, human eyes can’t see it, and it is not sion, you must have an accurate way of referring to the brightincluded in the apparent visual magnitude.
Astronomers often refer to distances “on” the sky as if the stars, sun, moon, and planets were equivalent to spots painted on a plaster ceiling. These angular distances (p. 17), measured in degrees, minutes of arc (p. 17), and seconds of arc (p. 17), are unrelated to the true distance between the objects in light-years. The angular distance across an object is its angular diameter (p. 17). ̈ What you see of the celestial sphere depends on your latitude. Much of the southern hemisphere of the sky is not visible from northern latitudes.