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The Stars education kit - Student activities 1-4
The Stars education kit - Student activities 1-4

... Activity 1: Time traveller Introduction Distances in astronomy are often very difficult to comprehend because they are so large. For example, the distance from the star Sirius to Earth is 84 320 000 000 000 km. This distance is too large for most people to imagine or understand. There are ways to ma ...
Document
Document

... Men and women have looked up at the sky and wondered about the things they see up there for as long as humans have lived on our Earth. Long ago, the Sun and Moon were mysterious objects that could be seen in the day and night. But the planets and stars were even more mysterious probably because they ...
Comets, Meteors, and Asteroids
Comets, Meteors, and Asteroids

... Time from New Moon to New Moon The moon revolves around Earth in 27.3 days, however, the period from one new moon to the next one is 29.5 days.  In the 27.3 days in which the moon orbits Earth, the Earth moves along its orbit around the sun.  The moon must go a little farther to be directly betwe ...
File - Philosophy, Theology, History, Science, Big
File - Philosophy, Theology, History, Science, Big

... Specifically, if something like Vilenkin's Many Worlds Ensemble is correct, then it is overwhelmingly more probable that we should be observing a much different universe then we in fact observe. If our universe were but one member of a collection of randomly ordered worlds, then it is vastly more pr ...
After School Guide to Ology Astronomy
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... The sun rises in the northeast in the summer time and the southeast in the winter time. Click on the money bag to return to the scoreboard ...
uv surface environment of earth-like planets orbiting
uv surface environment of earth-like planets orbiting

... We focus on four geological epochs from Earth’s history to model the UV environment on the surface of an Earth-like planet at the 1 AU equivalent distance from its host star. The geological evidence from 2.8–3.5 Ga is consistent with an atmosphere with similar atmospheric pressure as modern Earth (S ...
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... was 365.2421896698 days. Let’s see now how the Gregorian Calendar accounts for this. If we assumed that a year has 365.25 days exactly, then in 4 years, we would have 3 regular years of 365 and 1 leap year of 366 days amounting to 1461 days. However, 365.2421896698 x 4 = 1460.9687586792 days, so dur ...
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... (March 21) which, at the time, was in the Aries constellation. For this reason the first constellation of the zodiac is still called “Aries” even after the vernal equinox has moved away from the Aries constellation due to the precession of the Earth’s axis of rotation. It is important to distinguish ...
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... (March 21) which, at the time, was in the Aries constellation. For this reason the first constellation of the zodiac is still called “Aries” even after the vernal equinox has moved away from the Aries constellation due to the precession of the Earth’s axis of rotation. It is important to distinguish ...
Key Stage 3 Science - Priestley Smith School
Key Stage 3 Science - Priestley Smith School

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Atoms and Stars IST 3360 and IST 1990
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August - San Diego Astronomy Association
August - San Diego Astronomy Association

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Spectral fingerprinting student project
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... One way is to explore the light given off by faraway planets. Light can reveal clues about a planet’s properties. However, a planet’s visible light is dim and easily lost in the glare of its parent star. But scientists are working on technologies that will allow them to detect such planets. NASA’s T ...
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ELED 303
ELED 303

... and topaz. Rocks Rocks are any solid mass of mineral mater that occurs naturally. Most contain several minerals. Granite is a rock that contains quartz, hornblende, and feldspar, three common minerals. Processes of the Solid Earth Weathering Weathering occurs all around us, but because it is such a ...
ISNS3371_020107_bw - The University of Texas at Dallas
ISNS3371_020107_bw - The University of Texas at Dallas

... For an orbiting body, the inward and outward forces must equal each other (Newtons 3rd Law) - the centripetal force from orbital motion has to equal the centrifugal force from gravity: ...
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workshop - amfidromie.nl

... The ecliptic is the apparent path of the sun against the background of the stars. In the heliocentric world view it is the plane of the earth around the sun. Mesopotamian astronomers have divided the ecliptic in 12 signs of 30◦ each. We still name these signs by the (Greek) names of the constellatio ...
Moons and Small Solar System Bodies Sections 17.1-17.6
Moons and Small Solar System Bodies Sections 17.1-17.6

... • Second brightest object in the sky (what is brightest?) • “moon” – unknown origin of the word • Many primitive and modern societies base their religious ceremonies on the cycles of the moon (e.g., new and full moons). • Our month is based on moon’s cycle. • Human ovarian cycle is also synchronized ...
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... What Kind of Star is the Sun? Our solar system consists of the Sun, nine planets, their moons, planetoids/asteroids, meteors, and comets. The members of the solar system or the Sun’s family are the planets which revolve around the Sun. Planets rotate on their axis and shine through borrowed light f ...
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exo planets

... Around stars that might be able to support life, there is an area that gives the best chance for life to exist. It is an area that is not too hot and not too cold, but is just right—just like the story of Goldilocks and the Three Bears. So we call this area the Goldilocks zone. The temperature in th ...
Sample pages 2 PDF
Sample pages 2 PDF

... during some part of the year or could be not observable at all, at the position of the observer. Only circumpolar objects can be observed over the whole year. The most intuitive coordinate system is the alt-azimuth system, based on the location of the observer. The reference plane is the local horiz ...
Measuring Distances
Measuring Distances

... Measuring Distances Hold your finger out in front of your face at arm’s length. Look at your finger through each eye separately. What do you notice? This change in perspective is known as parallax. Ancient Greek astronomers expected to see a similar change in the positions of nearby stars if Earth ...
Chapter 20
Chapter 20

... In the first few years of exoplanet discovery, this problem left the nagging question of whether the objects were really planets or merely low-mass companion stars. They might even be objects called “brown dwarfs,” which have between about 10 and 75 times Jupiter’s mass, not quite enough to make it ...
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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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