Astronomy today by Eric Chaisson, Steve McMillan

By Eric Chaisson, Steve McMillan

With Astronomy this day, 8th Edition, relied on authors Eric Chaisson and Steve McMillan speak their pleasure approximately astronomy, supplying present and thorough technology with insightful pedagogy. The textual content emphasizes serious pondering and visualization, and it specializes in the method of clinical discovery, instructing scholars “how we all know what we know.” The 8th version has been completely up to date with the newest astronomical discoveries and theories and greater pedagogical features.

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D. 1 000 on Mexico's Yucatan peninsula. Was it an observatory, as some suggest, perhaps tied to human sacrifices when Venus appeared in the morning or evening sky? Or are the claimed aligmnents of its windows Ancient Astronomy 33 just wishful thinking and the temple's purpose simply reli­ gious, rather than astronomical? 2c), in Claco Canyon, New Mexico, is a gen­ uine astronomical calendar. 1rved stone spiral at noon on the summer solstice. Numerous similar sites have been found throughout the American Southwest.

E on sptheres lying within the celestial sphere that held the stars. The celestial sphere carried all interior spheres around with it, but the planetary (and solar) spheres had additional motions of their ONn, causing the Sun and planets to move relative to the stars. To avoid confusion, partial paths (dashed) of only two planets-Venus and)upiter-are drawn here. 8), rediscovered AristardlUS's heliocentric (Sun-centered) model and showed how, in its harmony and organization, it provided a more model as complicated as the Ptolemaic system as a clear sign of a fundamentally flawed theory.

Aristotle's influence was too strong, his followers too nwnerous, and his writings too comprehensive. D. 8 Nicolaus Copernicus (147l-1S43). (E. Lessillg/Art Resource, NY ) 38 CH A PT E R 2 The Copernican Revolution natural explanation of the observed facts than did the tangled retained unnecessary complexity and actually gained little geocentric cosmology. Copernicus asserted that Earth spins in predictive power over tile geocentric model. The helio­ on its axis and, like the other planets, orbits the Sun.

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