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Review: Quiz 1 Concepts Celestial sphere
Review: Quiz 1 Concepts Celestial sphere

... The precession of the poles was discovered by Hipparchus, but not the pattern." The daily motion of the sun is neither prograde nor retrograde. It is direct." The tropical year is 20 minutes longer than the orbital (sidereal) year." "No two orbits are exactly in the same plane, that's why conjunctio ...
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Earth and the Universe Name

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PowerPoint file - High Point University
PowerPoint file - High Point University

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PowerPoint Presentation - AST121 Introduction to Astronomy
PowerPoint Presentation - AST121 Introduction to Astronomy

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The Solar System - RHIG - Wayne State University
The Solar System - RHIG - Wayne State University

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6th Grade Science - Wichita Falls ISD

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No Slide Title

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Lecture 1 – Astronomy

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Astronomy Content from Frameworks

... The Moon changes in position in the sky each day. It also changes in appearance from a full Moon to a thin crescent. These changes are called phases. The Moon's light comes from the Sun, and the sunlight is reflected off the Moon's surface. The phase of the Moon that we see depends on the orientatio ...
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Orrery



An orrery is a mechanical model of the solar system that illustrates or predicts the relative positions and motions of the planets and moons, usually according to the heliocentric model. It may also represent the relative sizes of these bodies; but since accurate scaling is often not practical due to the actual large ratio differences, a subdued approximation may be used instead. Though the Greeks had working planetaria, the first orrery that was a planetarium of the modern era was produced in 1704, and one was presented to Charles Boyle, 4th Earl of Orrery — whence came the name. They are typically driven by a clockwork mechanism with a globe representing the Sun at the centre, and with a planet at the end of each of the arms.
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