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Teacher Checklist - Troup County Schools
Teacher Checklist - Troup County Schools

... Prior Learning: In 2nd grade students described the size, brightness, and patterns of stars. New learning is to describe the number and color.  Identify that there are more stars in the sky than a person can count oneat-a-time during an entire lifetime.  Explain that stars are like the sun, some b ...
The Scale of the Cosmos
The Scale of the Cosmos

... the only powerful signal sent purposely from Earth to other solar systems, Earth is sending out many other signals. • Short-wave radio signals, such as TV and FM, have been leaking into space for the past 50 years or so. ...
The Earth in Space and finding where we are.
The Earth in Space and finding where we are.

... • Everybody can see when the sun comes up, when its directly overhead its noon and when it goes down its dark…. • The spread of the railroads and more rapid transportation made it necessary to establish standard time zones. ...
The cosmic distance ladder
The cosmic distance ladder

... Kepler’s laws of planetary motion 1. Planets orbit in ellipses, with the Sun as one of the foci. 2. A planet sweeps out equal areas in equal times. 3. The square of the period of an orbit is proportional to the cube of its semi-major axis. ...
PSE - Spring Final Exam Study Guide - 2016
PSE - Spring Final Exam Study Guide - 2016

... 2. Describe what happens at the three different types of convergent boundaries and give at least two examples of what geologic features may result from each. 4. Describe the process of sea floor spreading. Where does it occur? 5. a. Name at least four pieces of evidence for the hypothesis of Contine ...
Tips Packet part 2 - Doral Academy Preparatory School
Tips Packet part 2 - Doral Academy Preparatory School

... • distance from Earth to the Sun, 93 million miles= 1 AU • Planet Distance from Sun in AU • Mercury ...
That star is an M-dwarf, smaller, dimmer and cooler than our sun. So
That star is an M-dwarf, smaller, dimmer and cooler than our sun. So

... light—to get there. It circles its home star, Kepler-186, in just 130 days. (11) That star is an M-dwarf, smaller, dimmer and cooler than our sun. So even though Kepler-186f sits closer to its sun than Mercury does to our sun, it is still safely located in a habitable zone. (12) Many scientists have ...
Nearest star`s wobbles could reveal Earth`s twin
Nearest star`s wobbles could reveal Earth`s twin

... Another Earth may be orbiting the star next door, and we could detect its presence within a few years, a new study argues. A telescope trained permanently on Alpha Centauri should be able to pick up the slight stellar wobbles induced by a small, rocky, Earth-like planet. Alpha Centauri lies just ove ...
Mission 1 - NC State University
Mission 1 - NC State University

... The Earth also has an axis, and it rotates on its axis every 24 hours. This is why there are 24 hours in a day. Revolution is when the Earth moves in a circle around the Sun, and rotation is when the Earth spins on its axis. Because the Earth rotates one time every 24 hours, at any point in a day, h ...
What is the Sun? - River Dell Regional School District
What is the Sun? - River Dell Regional School District

... As the field becomes more and more twisted, little loops of the magnetic field push up through the surface forming sunspots and coronal loops. Eventually, the field becomes so complex that it essentially breaks and reforms into a simpler shape. This process is what is thought to be behind the observ ...
I. Layers of the Sun
I. Layers of the Sun

... light is given off. Chromosphere: The layer that extends above the photosphere. Corona: Largest layer of the suns atmosphere and extends millions of km. ...
Astronomy Assignment #1
Astronomy Assignment #1

... 6. How does the Sun move with respect to the stars during the day? ...during the year? 7. Why does everyone have 12 hours of daylight on the equinoxes? 8. Why is the length of daylight in the northern hemisphere so short on December 21? 9. When will the Sun be at its highest altitude in the year in ...
Linking Asteroids and Meteorites through Reflectance
Linking Asteroids and Meteorites through Reflectance

... • Print it, copy it, or cut it out • Read it • Write one paragraph on why it is important or why you found it interesting • Staple them together • Write your name and ID number on front page • Write the first three letters of your last name in big letters on front page • Hand it in during next class ...
ph512-11-lec5
ph512-11-lec5

... (a.k.a. the umbrella effect). To high accuracy, if we look at an angle θ to the instantaneous motion with respect to some constant reference frame (say the Sun's motion), the displacement is δ θ = v sin θ /c. The amplitude of this annual aberration is 30 km/s × 206264.8 arcsec / c or 20 arcseconds i ...
Heliocentric or Geocentric
Heliocentric or Geocentric

... Sound is called “Mach Number” after Ernst Mach; he said “If there were any difference between Heliocentrism and Geocentricity, all rules of geometry would be violated”. Geo means “Earth”; Geometry is Earth measurement and Geocentricity has since been called Mach’s Principle. When an aircraft overtak ...
The Geographic Position of a Celestial Body
The Geographic Position of a Celestial Body

... GHA and Dec are equivalent to geocentric longitude and latitude with the exception that longitude is measured westward through −180° and eastward through +180°. Since the Greenwich meridian rotates with the earth from west to east, whereas each hour circle remains linked with the almost stationary ...
our planet - section 1
our planet - section 1

... of moons. There is also an asteroid belt. The planets are various sizes and distances from the Sun. They are found in this order as you move away from the sun. ...
Artifact # 2, The Solar System
Artifact # 2, The Solar System

... What makes it interesting is the ...
Night Sky
Night Sky

... Animation is for an observer in Champaign IL (40N). Note that the stars rise at an angle to the horizon (not straight up). The angle rise and set stars (including the sun) make with the horizon as they rise is the same for all rise and set stars for that observer. Stars near the celestial poles make ...
Starry Dome: Astronomy in Art and the Imagination
Starry Dome: Astronomy in Art and the Imagination

... rotating on its own axis. As a result, only one side of the moon consistently faces the Earth. This is where the idea of a ‘dark side’ of the moon comes from. However, the ‘dark side’ is in fact the far side, and is illuminated exactly as often as the near side, which faces the earth. While a number ...
AST301.Ch16.Sun
AST301.Ch16.Sun

... unlike photons (light), neutrinos essentially don’t interact with matter (except certain materials) and so pass directly through the whole sun. Most of these pass right through the earth too, but if we can collect a few of them using some kind of “neutrino telescope”, we would have a way of “seeing” ...
the K-12 Teacher Resource Packet for
the K-12 Teacher Resource Packet for

... rotating on its own axis. As a result, only one side of the moon consistently faces the Earth. This is where the idea of a ‘dark side’ of the moon comes from. However, the ‘dark side’ is in fact the far side, and is illuminated exactly as often as the near side, which faces the earth. While a number ...
ESRT - 2001 - Regents Earth
ESRT - 2001 - Regents Earth

... lived at the end of the Early Cambrian). ...
Aug14Guide - East-View
Aug14Guide - East-View

... Jupiter gradually moves away from the Sun during the month and appears to approach Venus, being only 0.2 degrees south of Venus on the 18th of August. This will be an interesting sight in the morning sky before sunrise. Saturn, in Libra, appears to close on Mars during the month and will be about th ...
{ Earth Science Reference Tables
{ Earth Science Reference Tables

... The drawing to the left shows the locations of the belts near the time of an equinox. The locations shift somewhat with the changing latitude of the Sun’s vertical ray. In the Northern Hemisphere, the belts shift northward in summer and southward in winter. ...
< 1 ... 111 112 113 114 115 116 117 118 119 ... 311 >

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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