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Level 4
Level 4

... Standard(s) being addressed: SC.4.E.5.1: Observe that the patterns of stars in the sky stay the same although they appear to shift across the sky nightly, and different stars can be seen in different seasons. SC.4.E.5.2: Describe the changes in the observable shape of the moon over the course of abo ...
Rotation and Revolution
Rotation and Revolution

... not. The side of the planet facing the sun experiences daytime; the other half has nighttime. On Earth, a period of rotation lasts about 24 hours or one day. Revolution is the movement of a planet in a path, called an orbit, around a star. The period of revolution is known as a year on that planet. ...
Numbers to Keep in Mind
Numbers to Keep in Mind

... have to be taken into account: §  Heliocentric Correction: because the Earth orbits the Sun, the light-travel time from an astronomical object may vary by up to ± 8.3 min. This is the heliocentric time correction (sometimes called the Rømer delay). (Note: there is also a heliocentric velocity correc ...
Lecture 3
Lecture 3

... Earth. Can only occur during New Moon. The Moon's shadow only covers small regions of the Earth.  Partial Eclipse: The Moon only covers part of the Sun.  Lunar Eclipse: The Earth is between the Sun and the Moon. Can only occur during Full Moon. Can also have partial eclipse. ...
The Solar system
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... brightest object in the night sky. The surface of Venus is often described as a "stormy desert" full of many craters and active volcanoes. And it takes 224 days for Venus to orbit around the sun. Venus rotates counterclockwise. Venus is the second planet from the Sun. ...
Intro to Earth science
Intro to Earth science

... • Earth Revolves around our start called the Sun • One of multiple planets in our solar system ...
Integrative Studies 410 Our Place in the Universe
Integrative Studies 410 Our Place in the Universe

... – Using a ruler marked in mm, we round to the nearest marking – at most off by half a division, or 0.5 mm – Cite a measurement of 15 mm as 15  0.5 mm to indicate that the real value of the length is likely to be anywhere between ...
Slide 1 - leslie09
Slide 1 - leslie09

... larger than that of Venus. The four seasons are a result of Earth's axis of rotation being tilted more than 23 degrees. ...
Earth, Moon, and Sun - Effingham County Schools
Earth, Moon, and Sun - Effingham County Schools

... 13. The Earth completes one rotation every 23 hours and 56 minutes and this period of time is classified as one Earth day. 14. The energy from the Sun is produced by nuclear fusion. 15. The coolest spots on the surface of the sun are sunspots. 16. Approximately 99% of the solar system’s mass is loca ...
Numbers to Keep in Mind
Numbers to Keep in Mind

... have to be taken into account: §  Heliocentric Correction: because the Earth orbits the Sun, the light-travel time from an astronomical object may vary by up to ± 8.3 min. This is the heliocentric time correction (sometimes called the Rømer delay). (Note: there is also a heliocentric velocity corre ...
keplers laws and newton - Fort Thomas Independent Schools
keplers laws and newton - Fort Thomas Independent Schools

... The cycle of these positions for a synodic period is different from the actual orbital period of the planet around the Sun (a sidereal period) because both the Earth and the planet orbit around the Sun. ...
OCN 201 Origin of the Universe
OCN 201 Origin of the Universe

... Math model 33 spheres within sphere motions clever attempt to reproduce retrograde motions ...
space facts sheet
space facts sheet

... Valles Marineris, is as wide as the United States. Might have had running water at one time. Has ice caps Largest volcano in the solar system, Olympus Mons Jupiter The largest planet has an atmosphere of cold hydrogen gas. It has many moons, so far 17 have been found. It has a giant red spot that is ...
Celestial Events of the Month of May, 2014
Celestial Events of the Month of May, 2014

... the Sun and will be fully illuminated as seen from Earth. This phase occurs at 19:16 UTC. This full moon was known by early Native American tribes as the Full Flower Moon because this was the time of year when spring flowers appeared in abundance. This moon has also been known as the Full Corn Plant ...
Final Exam: Review Questions
Final Exam: Review Questions

... a. The earth is spherical b. The earth is revolving 12. What is the name given to the day when there are equal amounts of daylight and darkness on all parts of the planet. 13. Calculate the average distance to the sun of a planet in AUs if it takes 24 yrs to make one orbit. (Hint: p2 = a3) ...
Quiz 2 material 104
Quiz 2 material 104

... Figure 2.3 (in book and shown above) shows the phases of Venus in the Heliocentric and Geocentric concepts. The phases of Venus during 2004 are also shown under diagram (a.) above the two models. The size and appearance of Venus shown under diagram (a.) above cannot be explained by the geocentric m ...
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The Solar System - Teachers TryScience
The Solar System - Teachers TryScience

... and nine known planets and the moons that orbit those planets. • The force of gravity keeps planets in orbit around the sun. ...
Gravity
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... that the force of gravity near the surface of the Earth is pretty much constant in magnitude and direction. The green lines are gravitational field lines. They show the direction of the gravitational force on any object in the region (straight down). In a uniform field, the lines are parallel and ev ...
Lecture 3 - Night Sky and Motion of the Earth around the Sun
Lecture 3 - Night Sky and Motion of the Earth around the Sun

... What causes the seasons? A) The orbit of the Earth is an ellipse, not a circle, and the Earth is closer to the Sun in summer than in winter. B) The rotation of the Earth is tilted relative to its orbit. ...
The Solar System
The Solar System

... and nine known planets and the moons that orbit those planets. • The force of gravity keeps planets in orbit around the sun. ...
Reading exercise
Reading exercise

... From far out in space, Earth looks like a blue ball. Since water covers three-fourths of the Earth’s surface, blue is the color we see most. The continents look brown, like small islands floating in the huge, blue sea. White clouds wrap around the Earth like a light blanket. T he Earth is shaped lik ...
Solutions 1
Solutions 1

... For the sun to appear on the zenith an observer must live between the Tropic of Cancer and the Tropic of Capricorn or between +23½ o and -23½ o of the Earth's equator (celestial equator). This is the result of the 23½ o tilt of the Earth's celestial equator with respect to the ecliptic (the path of ...
CH 26 PPT
CH 26 PPT

... • His model assigned small circular orbits to the planets (epicycles). The center of each small orbit moved around Earth on a larger circular orbit (deferent). • Even though observations didn’t always match his model, it was used by astronomers until the 16th century. ...
Grade 9 Science – Unit 4
Grade 9 Science – Unit 4

... Grade 9 Applied Science – Space ...
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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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