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The Sky
The Sky

... • Stars near celestial pole never drop below horizon. These are circumpolar stars. Now let’s expand the view of the Earth in this diagram…. ...
Graphing the Big Dipper Although they look close together from
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scale_moon
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... - phases of the moon caused by reflection of light from sun, not by earth’s shadow, as commonly thought - ideas of a new moon, full moon, when these happen - how celestial movement corresponds to our sense of time (months, years) - difference between eclipse and phases - Extensions for older kids – ...
8th Grade 2nd Semester Test Chapters 13, 16, 18
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... -It has as many as 39 or more moons, however only sixteen of them have been named and agreed upon. -It has a faint ring. -Jupiter’s power of gravity is so strong it grabs on to objects that come too close. -Atmospheric composition is 90% Hydrogen and 10% Helium. - The Red Spot is a hurricane. It is ...
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ISP 205: Visions of the Universe Fall 2001 Professor: ER Capriotti
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... D. the creation as starting with a huge explosion. E. the stars as distant suns. 2. Most Greek astronomers believed that the Earth is immobile because they did not observe A. retrograde motion of the planets. B. parallaxes for the stars. C. eclipses of the Sun. D. stellar motion. E. All of the other ...
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exercise 1

... Except for the Sun and the Moon, Venus is the brightest object in the sky. The planet is called the morning star when it appears in the east at sunrise, and the evening star when it is in the west at sunset. In ancient times the evening star was called Hesperus and the morning star Phosphorus or Lu ...
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... • In the 3rd Century B.C., a Greek, Aristarchus of Samos, figured out a way to measure the relative sizes and distances of the Moon and Sun. • He noticed that when the Moon was eclipsed by the Earth (월식) we can see the Earth's shadow creep across the face of the Moon. Earth's shadow is circular, and ...
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... the planet over time, making three sets of observations in six years. The images reveal that the bands ...
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ecliptic. - Valhalla High School
ecliptic. - Valhalla High School

... So, 360° = 24 h R.A., 15° = 1 h R.A., and 1° = 4 min R.A. Right ascension increases from west to east (note that we are looking at the exterior of the celestial sphere in the above picture). ...
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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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