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Astronomer Notes PowerPoint
Astronomer Notes PowerPoint

... so if gravity has curvature then anything with mass will curve the space around it ...
Habitats Jr. 04
Habitats Jr. 04

... The Sun is a star, just like all the other stars we can see at night. Stars are huge masses of hot, burning gas. The Sun is about 4.6 billion years old. It is the center of our solar system. As Earth turns, the Sun appears to move across the sky. This is not because the Sun is moving. Earth is rotat ...
AST101 Lecture 16 Extra Solar Planets
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... Lp = L*/4πd2 a πRp2 ~ L* (Rp/d)2 For the Earth, (Rp/d)2 ~5 x 108 For Jupiter, (Rp/d)2 ~108 ...
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... Appear to be tiny specks of white light Most vary in color and are much larger than Earth Motion • Stars move through the night sky towards the west • Stars rotate around the North Star, Polaris – _____________________________ = stars that circle around Polaris • Because of the earth’s rotation, som ...
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... C. It is located near the constellation Orion D. It is made up of stars from the constellation Orion ...
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... 11. The next day in class, have a group discussion of what they discovered. Review the homework and have one cutout of the sun ( which would be 76.7 inches in diameter relative to the cutouts that they used in their activity). 12. Wrap up the assignment with a discussion of the ...
Physics 20 Lesson 23 Orbits and Satellites
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... In Lesson 13 we learned about projectiles – where the vertical and horizontal components of motion act independently. For the projectile problems we worked with there was an unstated assumption that the Earth was flat. However, we know that the Earth is in fact spherical, although not perfectly so. ...
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here - Next Wave
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HS-ESS1-2 - Trimble County Schools
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... Jupiter • Jupiter is the biggest of all the planets! This is the 5th closest planet from the sun. Jupiter is named after the king of all roman gods. Jupiter is large enough to contain 1,300 earths! If you weighed 100 pounds on earth you would be about 260 pounds. A day on Jupiter is only 10 hours l ...
Scientific Revolution - W W W . M R S O B R Y A N . W E E B L Y
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... • After Brahe’s death, his assistant, the German astronomer and mathematician Johannes Kepler, used Brahe’s data to calculate the orbits of the planets revolving around the sun. • Kepler’s calculations supported Copernicus’ heliocentric theory. • His calculations also showed that the planets moved i ...
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... • Light is the fastest thing in the universe, but even light travels at a finite speed. • Speed of light = 186,000 miles 60 seconds 60 minutes ...
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... “lap” another planet (or when Mercury or Venus laps us) • But very difficult to explain if you think that Earth is the center of the universe! • In fact, ancients considered. but rejected the correct explanation. But they did have an explanation. ...
CENTRAL MICHIGAN UNIVERSITY
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... the techniques of astronomical data analysis. The observing will include visual observations, photography, and use of a CCD camera. ...
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... • Ptolemy used geometric models to predict the positions of the sun, moon, and planets, using combinations of circular motion known as epicycles. • An epicycle is an orbit within an orbit • Having set up this model, Ptolemy then went on to describe the mathematics which he needed in the rest of the ...
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... Draw a solar eclipse. What is the penumbra? Umbra? Identify each season and which latitude the sun is directly over? What is the Foucault pendulum prove? And how does it prove it? What is rotation? How long does it take? What is revolution? How long does it take? What are 2 pieces of evidence that o ...
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... is rather difficult, so we will restrict most of our analysis to the limiting case in which an ellipse becomes a circle. Most planetary orbits differ only very slightly from being circular. If a satellite has a circular orbit, its speed is ...
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... during the course of a day. (Where does it rise, where does it cross the meridian, and where does it set.) ...
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... Earth and the sun The cycle of seasons is caused by the Earth's tilt toward the sun. The planet rotates around an (invisible) axis. At different times during the year, the northern or southern axis is closer to the sun. During these times, the hemisphere tipped toward the star experiences summer, wh ...
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... This difference in Earth's orbital velocities (speed of an object in a specific direction) makes the Sun appear to move at different speeds at different times ...
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The Earth

... • The north pole is currently pointing to a spot near the star Polaris. Because the vernal equinox is the starting point for most star charts, the charts must be made for a certain period. The star charts must be updated periodically to account for this movement of the reference point. • Because of ...
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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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