Practical Astronomy With Your Calculator by Peter Duffett-Smith

By Peter Duffett-Smith

In its first variants, useful Astronomy along with your Calculator loved super good fortune. utilizing transparent and logical

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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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