• Study Resource
  • Explore
    • Arts & Humanities
    • Business
    • Engineering & Technology
    • Foreign Language
    • History
    • Math
    • Science
    • Social Science

    Top subcategories

    • Advanced Math
    • Algebra
    • Basic Math
    • Calculus
    • Geometry
    • Linear Algebra
    • Pre-Algebra
    • Pre-Calculus
    • Statistics And Probability
    • Trigonometry
    • other →

    Top subcategories

    • Astronomy
    • Astrophysics
    • Biology
    • Chemistry
    • Earth Science
    • Environmental Science
    • Health Science
    • Physics
    • other →

    Top subcategories

    • Anthropology
    • Law
    • Political Science
    • Psychology
    • Sociology
    • other →

    Top subcategories

    • Accounting
    • Economics
    • Finance
    • Management
    • other →

    Top subcategories

    • Aerospace Engineering
    • Bioengineering
    • Chemical Engineering
    • Civil Engineering
    • Computer Science
    • Electrical Engineering
    • Industrial Engineering
    • Mechanical Engineering
    • Web Design
    • other →

    Top subcategories

    • Architecture
    • Communications
    • English
    • Gender Studies
    • Music
    • Performing Arts
    • Philosophy
    • Religious Studies
    • Writing
    • other →

    Top subcategories

    • Ancient History
    • European History
    • US History
    • World History
    • other →

    Top subcategories

    • Croatian
    • Czech
    • Finnish
    • Greek
    • Hindi
    • Japanese
    • Korean
    • Persian
    • Swedish
    • Turkish
    • other →
 
Profile Documents Logout
Upload
MS Science - Kawameeh Middle School
MS Science - Kawameeh Middle School

... Earth and the Sun (cont.) • A spinning motion is called rotation. • The line on which an object rotates is the rotation axis. • The tilt of Earth’s rotation axis is always in the same direction by the same amount. • During half of Earth’s orbit, the north end of the rotation axis is toward the Sun ...
Lesson 37 questions – Gravitational Field - science
Lesson 37 questions – Gravitational Field - science

... Use equations from (b) and (ii) above to show that the mass of each star is given by M = 16π 2R3/GT2 F = GM2/4R2 F = 4π 2MR/T2 ...
The Sun and Planets Homework Solutions 4.
The Sun and Planets Homework Solutions 4.

... Calculate the following quantities for the orbits below: periastron and apoastron distances, minimum and maximum orbital speeds, and orbital period. Report your distances in AU, speeds in km/s, and periods in days. a) Earth orbits the Sun at a cozy average distance of 1 AU with a relatively small ec ...
Part 1
Part 1

... 35. The stars seen at night slowly change over the course of the year, this is because (A) the Earth rotates on its axis. (B) the Earth orbits about the Sun. (C) the Moon orbits the Earth. (D) the planets orbit the Sun. (E) You always see the same stars at night. Only your location on Earth matters ...
Comets, Asteroids, Meteoroids
Comets, Asteroids, Meteoroids

... Why are comets important? • Comets are made of the “leftovers” from the process of planet formation. • Each comet is a sample of the early solar system. ...
UCSB CLAS
UCSB CLAS

... A planet (P) is moving around the Sun (S) in an elliptical orbit. As the planet moves from aphelion to perihelion, the Sun’s gravitational force A. does positive work on the planet. B. does negative work on the planet. C. does positive work on the planet during part of the motion and negative work d ...
Study guide
Study guide

... 2. What is the current explanation for the low albedo of many Uranian & Neptunian moons? 3. Why did astronomers suspect that an 8th planet existed before it was actually discovered? 4. Which moon will probably fall within its primary’s Roche limit in 100my and be destroyed? 5. Who discovered Neptune ...
Introduction to Astronomy
Introduction to Astronomy

... There are many different types of rock on our planet. These can be divided into three groups: metamorphic, igneous and sedimentary. The category a rock goes into is dependent on how it was formed. Igneous means ‘made by fire’ – for example, granite. Some igneous rocks come from volcanoes. Sedimentar ...
May 8, 2012 - Plummer Pumas Science
May 8, 2012 - Plummer Pumas Science

... B. Describe how the characteristics identified in part A would change if the following changes were made. The Earth was moved closer to the Sun. __________________________________________________________________________________________________ ________________________________________________________ ...
Thinking About Gravity
Thinking About Gravity

... in. For example, a black hole is one pinpoint in space with sooooo much mass that its gravitational pull is sooooo strong even light can’t escape its pull! However, regardless of how strong its pull is, if you don’t get near it, you won’t be pulled in. In order for gravity to work, one of the object ...
study-notes-for-2016-2017-1st-qtr-exam
study-notes-for-2016-2017-1st-qtr-exam

... Moons are natural satellites that revolve around something larger like a planets and asteroids. Most moons are usually made of rock. In our solar system every planet has moons except for Mercury and Venus. The Earth’s moon causes the Earth to experience tides. Finally, because of the Earth’s moon is ...
Phys 100 – Astronomy (Dr. Ilias Fernini) Review Questions for
Phys 100 – Astronomy (Dr. Ilias Fernini) Review Questions for

... Earth, Solar System, Milky Way, galaxy clusters Solar System, Earth, galaxy clusters, Milky Way Earth, Milky Way, Solar System, galaxy clusters Galaxy clusters, Solar System, Milky Way, Earth ...
Mysteries Of Space
Mysteries Of Space

... Do not be mistaken ,the planets are not in a straight line.The opposite in fact. The order of the planets from the Sun are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. In between these amazing planets are dwarf planets such as Pluto, Ceres, Makemake, Haumea and Eris. A dwarf pla ...
Name
Name

... autumn) to southwest (first day of winter) and back to west (first day of spring). This constant shifting is caused by the fact that Earth’s axis is “tilted” by 23.5 degrees. As a result, the ecliptic does not run from east to west across the sky, but at an angle. 4. Look at the position of Jupiter. ...
Astronomy in Ancient Cultures
Astronomy in Ancient Cultures

... These are the things ancient cultures could observe, without the aid of technology! (The Sun, Mercury, Venus, Mars, Jupiter, Saturn, Meteors, Comets, and Stars.) Astronomy is the oldest science. There is evidence of crude astronomy even in prehistoric times. Early astronomy was about observing the m ...
Grade 9 Unit 4: Space
Grade 9 Unit 4: Space

... c. Describe and explain the apparent motion of celestial bodies. (moon, sun, planets, comets, and asteroids) (359-361) i. Identify that celestial bodies move in cyclic paths called orbits and that these orbits result from gravitational forces. ii. Identify that planets, suns, and moons revolve (spin ...
Earth
Earth

... • Greenhouse effect: Increases surface T (e.g., Venus, at 0.72 AU, is within HZ, but Ts~745 K!) • Lifetime of star: larger mass = shorter lifetime (must be long enough for evolution) • UV radiation emission: larger mass = more UV (deleterious to life… as we know it) • Habitable zone moves outward wi ...
PH212 Chapter 13 Solutions
PH212 Chapter 13 Solutions

... to find the orbital speed and period. Apply the conservation of energy expression, Eq. (7.13), to calculate the energy input (work) required to separate the two stars to infinity. (a) S ET U P : The cm is midway between the two stars since they have equal masses. Let R be the orbit radius for each s ...
Evidence of the Big Bang and Structure of the Universe
Evidence of the Big Bang and Structure of the Universe

... original Big Bang using sensitive receivers  The use of the Hubble Space Telescope and other instruments have led to the predicted age of the universe: 13.7 billion years ...
Lecture07-ASTA01 - University of Toronto
Lecture07-ASTA01 - University of Toronto

... Alexander the Great. Aristotle was not very interested in extrasolar planetary systems or their formation, or other unobservable things. But (unfortunately) he was extremely influential after 1.5*103 yrs. His world was geocentric, unchanging and unique. The four elements moved each to their 'natural ...
Name
Name

... A) Isaac Newton B) Albert Einstein C) Jocelyn Bell. D) Cecilia Payne-Gaposchkin E) Annie Jump Cannon 26) Which part (or layer) of the Sun has the hottest temperature? A) core B) corona C) chromosphere. D) photosphere E) convection zone 27) Observations of solar neutrinos allow astronomers to gather ...
Name
Name

... No notes, No books; You can use calculators The letter at the top of the test needs to correspond to letter at top of the answer sheet. Constants that you may need to know: • c = 3 x 108 m/s • G = 6.67 x 10-11 m3/(kg-s2) • h = 6.626 x 10-34 J-s • g = 9.8 m/s2 • σ = 5.7 x 10-8 W/(m2-K4) • 1 parsec = ...
WORD - hrsbstaff.ednet.ns.ca
WORD - hrsbstaff.ednet.ns.ca

... 12. An imaginary sphere of infinite extent with Earth at its center on which the stars, planets, and other heavenly bodies appear to be located is known as the a. Zodiac. b. celestial sphere. c. atmosphere. d. Valhalla. 13. Which one of the following statements is true about the celestial coordinat ...
Chapter 2 - El Camino College
Chapter 2 - El Camino College

... Axial Tilt of the Earth: Winter and Vernal Seasons (Cont.) ...
Light Phenomena Around Us
Light Phenomena Around Us

... are called "phases" of the Moon. ...
< 1 ... 186 187 188 189 190 191 192 193 194 ... 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.
  • studyres.com © 2025
  • DMCA
  • Privacy
  • Terms
  • Report