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Solar System Bead Distance Activity
Solar System Bead Distance Activity

... Our Solar System is immense in size by normal standards. We think of the planets as revolving around the Sun, but rarely consider how far each planet is from the Sun. Furthermore, we fail to appreciate the even greater distances to the other stars. Astronomers use the distance from the Sun to the Ea ...
Chapter 10
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... of Ptolemy, they were used to help locate and predict the positions of the Sun, Moon and stars  Using a compass and an astrolabe, they were able to describe the position of any celestial body in relation to the direction North as well as in relation to the horizon. ...
Space 8.1 notes
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... amounts of energy and is held together by its own gravity, keeping it intact  Stars are considered luminous because they produce and give off their own light. SUN  The sun is an average sized star, as most stars are significantly larger than our sun  The sun looks large to our eyes because it is ...
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History of Astronomy

... Overcoming the second objection (nature of motion): Galileo’s experiments showed that objects in air would stay with a moving Earth. • Aristotle thought that all objects naturally come to rest. • Galileo showed that objects will stay in motion unless a force acts to slow them down (Newton’s first l ...
History of Astronomy
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SOLAR SYSTEM DEFINITIONS
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Timeline, Topics, and Resources for iMovie Projects
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... work when it was available. This was not until 1543, the year Copernicus died. As Copernicus' new picture of the universe became more widely known, misgivings arose. The universe had after all been created for mankind, so why wasn't mankind at the center? An intellectual revolutionary called Giorda ...
Semester Review Answers - School District of La Crosse
Semester Review Answers - School District of La Crosse

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Our Solar System
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Models of Our Solar System

... extremely complicated it did match observations fairly well. This model was accepted for nearly 1400 years, and there are actually people who believe it is true today. ...
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Review Unit 1 - Effingham County Schools
Review Unit 1 - Effingham County Schools

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astronomy ch 2 - Fort Thomas Independent Schools
astronomy ch 2 - Fort Thomas Independent Schools

... How much force does it take to keep an object moving in a straight line at a constant speed? Unless an object is subject to an outside force, it takes no force at all to keep it moving in a straight line at a constant speed. How does an object’s mass differ when measured on the Earth and on the Moon ...
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Light year - TeacherWeb
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Study Guide 2 - Otterbein University
Study Guide 2 - Otterbein University

... 2. Why did Ptolemy have to use epicycles? 3. Why did Copernicus have to use epicycles? Warm-up #13: based on Section 1.2. “The Birth of Modern Astronomy” 1. In which ways were Galileo’s telescopic observations at odds with Aristotelianism? Do not just state some things he observed, but explain why t ...
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Common Misconceptions in Astronomy and History
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... never intended their ideas to represent reality, but by the time of the Renaissance, Ptolemy's geocentric model was accepted as a accurate portrayal of the cosmos. Copernicus realized the inexactness of the cumbersome geocentric models to predict accurately planetary positions and borrowed ideas fro ...
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... • Model was no more accurate than Ptolemaic model in predicting planetary positions, because it still used perfect circles. ...
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... Ptolemy – AD 150 he published a summary of all that was known about astronomy. It was used for more than 1,000 years. Ptolemy questioned Aristotle’s model because it did not explain all the observe motion of the planets. For example, Mar’s movement (over a period of weeks) is creates a loop or S sha ...
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Copernican heliocentrism



Copernican heliocentrism is the name given to the astronomical model developed by Nicolaus Copernicus and published in 1543. It positioned the Sun near the center of the Universe, motionless, with Earth and the other planets rotating around it in circular paths modified by epicycles and at uniform speeds. The Copernican model departed from the Ptolemaic system that prevailed in Western culture for centuries, placing Earth at the center of the Universe, and is often regarded as the launching point to modern astronomy and the Scientific Revolution.Copernicus was aware that the ancient Greek Aristarchus had already proposed a heliocentric theory, and cited him as a proponent of it in a reference that was deleted before publication, but there is no evidence that Copernicus had knowledge of, or access to, the specific details of Aristarchus' theory. Although he had circulated an outline of his own heliocentric theory to colleagues sometime before 1514, he did not decide to publish it until he was urged to do so late in his life by his pupil Rheticus. Copernicus's challenge was to present a practical alternative to the Ptolemaic model by more elegantly and accurately determining the length of a solar year while preserving the metaphysical implications of a mathematically ordered cosmos. Thus his heliocentric model retained several of the Ptolemaic elements causing the inaccuracies, such as the planets' circular orbits, epicycles, and uniform speeds, while at the same time re-introducing such innovations as,Earth is one of several planets revolving around a stationary Sun in a determined orderEarth has three motions: daily rotation, annual revolution, and annual tilting of its axisRetrograde motion of the planets is explained by Earth's motionDistance from Earth to the Sun is small compared to the distance to the stars.↑ 1.0 1.1 ↑
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