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THE SKY - n Nebbe
THE SKY - n Nebbe

... • Earth’s axis precesses, taking about 26,000 years for one cycle. ...
Day 3
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... planetary positions. •  Still could not detect stellar parallax, and thus still thought Earth must be at center of solar system (but recognized that other planets go around Sun). •  Hired Kepler, who used Tycho's observations to discover the truth about planetary motion. Tycho Brahe (1546-1601) ...
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... tilted towards the Sun in the summer, giving us more hours of sunlight. 6. What percentage of Earth is illuminated or lit up at any given time? 50% Half of the Earth is in the sunlight & the other half of Earth is having nighttime. 7. What percentage of Earth is dark, or having night at any given ti ...
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PDF Version

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Light and Telescopes - Otterbein University
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... of the Earth going around and around the Sun. From our perspective on Earth, we then expect to see nearby stars shifting back and forth much more dramatically than the more remote stars. Very distant stars will scarcely budge. (In reality, the stars are so remote that the annual shifts are barely de ...
PDF version - Caltech Astronomy
PDF version - Caltech Astronomy

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... – 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 ...
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... “The Earth is a geologically active planet with a surface that is constantly changing. Unlike the other three inner planets, it has large amounts of life-supporting water and an oxygenrich atmosphere. The Earth’s protective atmosphere blocks out most of the sun’s damaging rays and heat.” Earth is th ...
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... of northern and southern hemisphere. After viewing, have the students write their birthdays on a piece of paper. Next ask them to write what the weather is like in the northern hemisphere on their birthday. Then have them write what the weather would be like on their birthday in the southern hemisph ...
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... 45. Explain how Ptolemy and Copernicus differ in their explanation of retrograde motion in the Universe. 46. Distinguish between Geosynchronous and orbiting satellites. 47. Identify 4 different ways that Satellite technology has helped in the advancement of our lives. 48. Discuss the essential diffe ...
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... turn out to be rocky, there's another problem: M-dwarfs tend to be volatile beasts, with far more sunspot and flare activity than the sun has, along with greater fluctuations in brightness. It might be tough for life to arise and survive in such a hostile environment, especially since the Goldilocks ...
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... approximately one month. Describe the apparent movement of the sun and moon across the sky through day/ night and the seasons. universe- Everything that exists anywhere in space. It includes all the galaxies, stars, planets, and other bodies that they may contain. star- A huge ball of glowing gas th ...
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... The sun is a medium-sized star. Stars that are much larger than the sun are called ______________ or __________________.  Composition – The chemical composition of most stars is about 73 % ______________ and 25 % ____________________. How can astronomers infer which elements are found in stars? ___ ...
Space - PAMS-Doyle
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... • The distance between planets and sizes of the planets vary greatly. The outer, “gas” planets are very large, and the four inner planets are comparatively small and rocky. On one end write the sun and the other Pluto. Fold your paper in half, at the crease write Uranus. Fold Pluto up to Uranus, at ...
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Copernican heliocentrism



Copernican heliocentrism is the name given to the astronomical model developed by Nicolaus Copernicus and published in 1543. It positioned the Sun near the center of the Universe, motionless, with Earth and the other planets rotating around it in circular paths modified by epicycles and at uniform speeds. The Copernican model departed from the Ptolemaic system that prevailed in Western culture for centuries, placing Earth at the center of the Universe, and is often regarded as the launching point to modern astronomy and the Scientific Revolution.Copernicus was aware that the ancient Greek Aristarchus had already proposed a heliocentric theory, and cited him as a proponent of it in a reference that was deleted before publication, but there is no evidence that Copernicus had knowledge of, or access to, the specific details of Aristarchus' theory. Although he had circulated an outline of his own heliocentric theory to colleagues sometime before 1514, he did not decide to publish it until he was urged to do so late in his life by his pupil Rheticus. Copernicus's challenge was to present a practical alternative to the Ptolemaic model by more elegantly and accurately determining the length of a solar year while preserving the metaphysical implications of a mathematically ordered cosmos. Thus his heliocentric model retained several of the Ptolemaic elements causing the inaccuracies, such as the planets' circular orbits, epicycles, and uniform speeds, while at the same time re-introducing such innovations as,Earth is one of several planets revolving around a stationary Sun in a determined orderEarth has three motions: daily rotation, annual revolution, and annual tilting of its axisRetrograde motion of the planets is explained by Earth's motionDistance from Earth to the Sun is small compared to the distance to the stars.↑ 1.0 1.1 ↑
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