
History of Astronomy
... • Assumed that the imperfect Earth was surrounded by perfect heavenly spheres Ptolomy’s model worked so well, it was not challenged for 1300 years! ...
... • Assumed that the imperfect Earth was surrounded by perfect heavenly spheres Ptolomy’s model worked so well, it was not challenged for 1300 years! ...
Gravitation and the Motion of the Planets
... One of Galileo’s most important discoveries with the telescope was that Venus exhibits phases like those of the Moon Galileo also noticed that the apparent size of Venus as seen through his telescope was related to the planet’s phase Venus appears small at gibbous phase and largest at crescent ...
... One of Galileo’s most important discoveries with the telescope was that Venus exhibits phases like those of the Moon Galileo also noticed that the apparent size of Venus as seen through his telescope was related to the planet’s phase Venus appears small at gibbous phase and largest at crescent ...
Greek and Hellenistic astronomy
... was that it could not explain all the observed motion of the celestial bodies satisfactorily. Seasonal change in the star position could not be easily explained by Aristotle’s naïve model. It could not also explain why the Moon waxed and waned over a period of one month. But the apparent motion of t ...
... was that it could not explain all the observed motion of the celestial bodies satisfactorily. Seasonal change in the star position could not be easily explained by Aristotle’s naïve model. It could not also explain why the Moon waxed and waned over a period of one month. But the apparent motion of t ...
Quiz 2 Review Answers
... 2. Match the following scientists to their major contribution: Newton, Galileo, Kepler, Tycho, and Copernicus. a. Formulated the heliocentric theory ...
... 2. Match the following scientists to their major contribution: Newton, Galileo, Kepler, Tycho, and Copernicus. a. Formulated the heliocentric theory ...
The Waltz of the Planets and Gravity
... A planet’s synodic period is measured with respect to the Earth and the Sun (for example, from one opposition to the next) ...
... A planet’s synodic period is measured with respect to the Earth and the Sun (for example, from one opposition to the next) ...
Astronomy
... Astronomy differs from Astrology in that one is based on observable and quantifiable data. The body of knowledge in this field has grown through the centuries due to measurable and reproducible investigations. The other is more subjective. ...
... Astronomy differs from Astrology in that one is based on observable and quantifiable data. The body of knowledge in this field has grown through the centuries due to measurable and reproducible investigations. The other is more subjective. ...
File history of astronomy
... • Claudius Ptolemy published the Ptolemaic system in 141 A.D. • This system accounted for the movements of the planets, but was still a Geocentric model which was determined to be inaccurate • Ptolemy discovered retrograde motion ...
... • Claudius Ptolemy published the Ptolemaic system in 141 A.D. • This system accounted for the movements of the planets, but was still a Geocentric model which was determined to be inaccurate • Ptolemy discovered retrograde motion ...
Year 7 Gravity and Space
... billions and billions of galaxies, some bigger, some smaller than ours. A spiral galaxy – like our own ...
... billions and billions of galaxies, some bigger, some smaller than ours. A spiral galaxy – like our own ...
Geocentric vs. Heliocentric
... 1632: "Dialogo Dei Massimi Sistemi" (In Italian! Not Latin! For the common people!) He published his masterpiece, Dialogue on the Two Chief World Systems, in which he had two people, one representing the view of Ptolemy and other the view of Copernicus, present their arguments before an intelligent ...
... 1632: "Dialogo Dei Massimi Sistemi" (In Italian! Not Latin! For the common people!) He published his masterpiece, Dialogue on the Two Chief World Systems, in which he had two people, one representing the view of Ptolemy and other the view of Copernicus, present their arguments before an intelligent ...
Brobo_solarsystem_faceoff
... 60. The Great Dark Spot belongs to what planet? 61-64. Name the four dwarf planets 65*. What is the difference between a dwarf planet and a plutoid? 66. Currently there are only two Plutoids. One of them is Pluto- what is the other? 67. What is the only difference between an astroid and a meteroid? ...
... 60. The Great Dark Spot belongs to what planet? 61-64. Name the four dwarf planets 65*. What is the difference between a dwarf planet and a plutoid? 66. Currently there are only two Plutoids. One of them is Pluto- what is the other? 67. What is the only difference between an astroid and a meteroid? ...
history of astro outline 2014
... Moon (the change in the apparent size of Venus was related to the planet’s phase) 2. The orbit of Jupiter’s moons: Jupiter’s moons (Galileo observed the location of the four moons of Jupiter over time, and concluded that they are ...
... Moon (the change in the apparent size of Venus was related to the planet’s phase) 2. The orbit of Jupiter’s moons: Jupiter’s moons (Galileo observed the location of the four moons of Jupiter over time, and concluded that they are ...
Study Guide for Quiz on Astronomy: The Moon, Sun
... 17. How is distance measured in the universe? __________________________________________ 18. In which galaxy do we live? __________________________________What kind of galaxy is it? ___________ At what location in our galaxy is our solar system?________________________ 19. Which planet is considered ...
... 17. How is distance measured in the universe? __________________________________________ 18. In which galaxy do we live? __________________________________What kind of galaxy is it? ___________ At what location in our galaxy is our solar system?________________________ 19. Which planet is considered ...
Lecture 3 Geocentrism vs.Heliocentrism
... Lecture 3 Geocentrism vs. Heliocentrism Dennis Papadopoulos ASTR 340 Fall 2006 ...
... Lecture 3 Geocentrism vs. Heliocentrism Dennis Papadopoulos ASTR 340 Fall 2006 ...
Motion of stars, planets
... revolve around the earth: explains daily movement • To account for unusual planetary motion epicycles were introduced • Fit the Greek model of heavenly perfection – spheres are the perfect shape, circular the perfect motion ...
... revolve around the earth: explains daily movement • To account for unusual planetary motion epicycles were introduced • Fit the Greek model of heavenly perfection – spheres are the perfect shape, circular the perfect motion ...
Lecture 2 - University of Chicago, Astronomy
... Aristotelian world system. By his time astronomical observations improved so much that it became clear that the original Aristotelian system does not agree with them. ...
... Aristotelian world system. By his time astronomical observations improved so much that it became clear that the original Aristotelian system does not agree with them. ...
Tayler Vence PHYS 1010 5/5/2013 The Copernican Revolution The
... that simple epicycles could not account for all of the irregularities in the planetary motions. In response to this many medieval astronomers proposed more complex epicycles. In these new epicycles circles moved along circles that were moving along other circles. As these epicycle theories continued ...
... that simple epicycles could not account for all of the irregularities in the planetary motions. In response to this many medieval astronomers proposed more complex epicycles. In these new epicycles circles moved along circles that were moving along other circles. As these epicycle theories continued ...
Chapter 2: Emergence of Modern Astronomy
... Measure synodic period (position relative to Sun) then calculate sidereal period (change sign for superior planets) ...
... Measure synodic period (position relative to Sun) then calculate sidereal period (change sign for superior planets) ...
Document
... • Made systematic measurements as early as ~2000 BC • By ~ 800–400 BC – State support for the calendar and astrology – Compiled the first star catalogs and began longterm records of planetary motions – Were able to predict lunar and solar eclipses ...
... • Made systematic measurements as early as ~2000 BC • By ~ 800–400 BC – State support for the calendar and astrology – Compiled the first star catalogs and began longterm records of planetary motions – Were able to predict lunar and solar eclipses ...
Our Place in the Cosmos
... Introduction to Astrophysics Lecture 2 Historical Milestones in Astronomy ...
... Introduction to Astrophysics Lecture 2 Historical Milestones in Astronomy ...
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.