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looking up! - Discover the universe
looking up! - Discover the universe

... • Stars: It is possible to see thousands of stars in a very dark sky, away from light pollution. However, this number drops to only a few dozen in cities because of artificial lights. • Moon: The Moon is the easiest object to observe in the night sky. Different phases can be observed during a 30-d ...
Information extracted from Britannica 97
Information extracted from Britannica 97

... plane.) Pluto thus rotates nearly on its side in a retrograde direction, and an observer on its surface would see the Sun rise in the west and set in the east. Pluto is by far the smallest planet, having a diameter less than half that of Mercury; it is about two-thirds the size of the Moon. Pluto's ...
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... Europa, Ganymede and Callisto (now known as the Galilean moons) and recorded their motions back and forth around Jupiter. This was the first discovery of a center of motion not apparently centered on the Earth. It was a major point in favor of Copernicus's heliocentric theory of the motions of the p ...
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our planet the earth byalko - ArvindGuptaToys Books Gallery
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... the stars have changed positions. This change is however universal: the whole world of stars rotates around us. Of course you know that i t is, in fact, the Earth which rotates in relation to- stars. - . -To simplify the orientation in space we should rather disregard the Earth's rotation. Imagine t ...
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... A Giant Molecular Cloud formed where the Sun was formed at the centre where gravity was at a maximum. The rest of the mass formed a protoplanetary disk out of which the rest of the solar system bodies were formed such as planets, moons etc. The solar currents formed by the spinning disk mean that pl ...
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... • During the uncertainties of the era, Hubble was able to observe galaxies at distances up to 7 million light years away. By doing so he was able to come up with Hubble's Law, which said that the further galaxies were away from earth the faster they moved away from our planet. Hubble's rule proved t ...
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Geocentric model



In astronomy, the geocentric model (also known as geocentrism, or the Ptolemaic system) is a description of the cosmos where Earth is at the orbital center of all celestial bodies. This model served as the predominant cosmological system in many ancient civilizations such as ancient Greece including the noteworthy systems of Aristotle (see Aristotelian physics) and Ptolemy. As such, they believed that the Sun, Moon, stars, and naked eye planets circled Earth.Two commonly made observations supported the idea that Earth was the center of the Universe. The stars, the sun, and planets appear to revolve around Earth each day, making Earth the center of that system. The stars were thought to be on a celestial sphere, with the earth at its center, that rotated each day, using a line through the north and south pole as an axis. The stars closest to the equator appeared to rise and fall the greatest distance, but each star circled back to its rising point each day. The second observation supporting the geocentric model was that the Earth does not seem to move from the perspective of an Earth-bound observer, and that it is solid, stable, and unmoving.Ancient Roman and medieval philosophers usually combined the geocentric model with a spherical Earth. It is not the same as the older flat Earth model implied in some mythology, as was the case with the biblical and postbiblical Latin cosmology. The ancient Jewish Babylonian uranography pictured a flat Earth with a dome-shaped rigid canopy named firmament placed over it. (רקיע- rāqîa').However, the ancient Greeks believed that the motions of the planets were circular and not elliptical, a view that was not challenged in Western culture until the 17th century through the synthesis of theories by Copernicus and Kepler.The astronomical predictions of Ptolemy's geocentric model were used to prepare astrological and astronomical charts for over 1500 years. The geocentric model held sway into the early modern age, but from the late 16th century onward was gradually superseded by the heliocentric model of Copernicus, Galileo and Kepler. There was much resistance to the transition between these two theories. Christian theologians were reluctant to reject a theory that agreed with Bible passages (e.g. ""Sun, stand you still upon Gibeon"", Joshua 10:12 – King James 2000 Bible). Others felt a new, unknown theory could not subvert an accepted consensus for geocentrism.
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