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WINNING STORY - Atlantis Short Story Contest
WINNING STORY - Atlantis Short Story Contest

... I was slowly floating, completely at ease, when I realized I had just gone past the two most conspicuous of the stars that make up the Orion constellation. I was taken aback by how large, mighty and bright they were. From people’s viewpoint on Earth, it looks like these celestial bodies are located ...
Earth and Space - Pearson SuccessNet
Earth and Space - Pearson SuccessNet

... sky. But many stars are bigger and brighter than the sun. Others are smaller and not as bright. You cannot see stars during the day because the sun is so bright. If you are in a place that has a lot of lights, it may be hard to see stars at night. ...
Fulltext PDF - Indian Academy of Sciences
Fulltext PDF - Indian Academy of Sciences

... Careful observations to begin with, and careful thinking about them; combine the two, and many aspects of the roots of perceived reality begin to emerge. We discern underlying simplicity behind all the complexity, there is unsuspected order underneath the confusing chaos, patterns behind what seems ...
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... neither points toward nor away from the Sun. (However, the tilt of Earth relative to its plane of orbit, called the ecliptic plane, is always about 23.5 degrees.) Vernal Equinox Questions and Answers Question: Why doesn’t the vernal equinox (equal night) on March 20 have the same number of hours for ...
Chapter 10 - Macmillan Learning
Chapter 10 - Macmillan Learning

... 65. •Astronomy The International Space Station (ISS) ­orbits Earth in a nearly circular orbit that is 345 km above Earth’s surface. (a) How many hours does it take for the ISS to make each orbit? (b) Some of the experiments performed by ­astronauts in the ISS involve the effects of “weightlessness” ...
HOLIDAYS HOME WORK
HOLIDAYS HOME WORK

... The Percentage Error in A,B,C,D are in 1%,2%,4%,2% respectively. Find the Percentage Error in Q. Q11. The radius of curvature of a Concave Mirror, measured by Spherometer is given by R. The values of ‘l’ and ‘h’ are 4 cm and 0.65 cm respectively. Compute the error in measurement of radius of curvatu ...
Card Game - Learning Resources
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Week 3: Kepler`s Laws, Light and Matter
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... motion of a planet around the Earth in small circles (epicycles) whose center moves on the large circular orbit around the Earth. Although Ptolemaic model could account for the retrograde motion, it made wrong testable predictions and had to be abandoned. For instance, according to this model, Venus ...
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1. Base your answer to the following question on the
1. Base your answer to the following question on the

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... Response addresses all parts of the question clearly and correctly. A. The diagram shows the Earth tilted toward the Sun in the summer for the Northern Hemisphere and away when it is winter. At each of the equinoxes the Earth should not be tilted toward or way from the sun. B. The sun’s rays would b ...
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... days. Normally, as seen from Earth, the spots appear to move in straight lines only when our planet crosses the plane of the solar equator. It happens only twice in a year: in early June and December (see figure 7). At these moments, both the Sun poles are situated exactly on the limb. In figure 4 i ...
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The Origin of the Solar System
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Peter Martinson: Defeating the Oligarchical Principle
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... that’s coming into our system. It mediates everything; it interacts with our own magnetic field. It directs In fact, if you look at the number of large earth- charged matter and plasma into or away from our quakes we’ve been having over the last decade, it’s planet. The magnetic field is dropping ra ...
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... hydrogen, helium, ammonia, and methane, are gases under normal conditions on Earth. But in the interiors of these planets, pressures are so high that these substances are liquids, not gases. The Jovian planets might be better described as “liquid giants”! As you might expect, a planet’s surface temp ...
Astronomical Knowledge Questionnaire (Teacher
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...  It will have lost its outer layers, leaving its core behind.  It will explode, destroying Earth.  It will not die due to its mass.  I do not know the answer to this question. 13 How did the planets orbiting our Sun form?  The planets and the Sun formed at the time of the Big Bang.  The planet ...
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Wazzat Mean - Peterborough Astronomical Association
Wazzat Mean - Peterborough Astronomical Association

... Fledgling astronomers are victims of the same malady. Mix that ancient root language with today’s penchant for acronyms and the beginning astronomer is confronted with a mind-numbing mixture of Latin lingo and modern day alphabet soup. This article hopes to make sense of much of it. Angular Size and ...
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The Earth`s Orbital Velocity
The Earth`s Orbital Velocity

... This lab will follow the procedures outlined in the Sky and Telescope reprint entitled "The Earth's Orbital Velocity." A diagram of the Earth's position with respect to Arcturus is given below. The two spectra of Arcturus were obtained when the Earth was located at position "A" and position "B" in t ...
Planetary and Satellite Motion
Planetary and Satellite Motion

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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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