GCSE Astronomy Topic 1 Key Facts The Earth Eratosthenes first measured the circumference of the Earth accurately. He measured the altitude of the Sun North of a place where the Sun was at the zenith at exactly the same time. Knowing the distance and the angle one can work out the circumference. The Earth is a slightly flattened sphere with average diameter 13‚000km The Earth takes 23 hours 56 minutes to rotate. This is a sidereal day. The Earth is the only known planet with liquid water and a range
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Waves ‚ Tides and Sediment Cells L.O. = to compare and contrast constructive & destructive waves‚ to understand wave refraction‚ to understand the difference between spring and neap tides and to identify the UK’s sediment cells. Wave Characteristics Wavelength = the distance between the crest of two adjacent waves. Wave Amplitude = the distance between sea level and the crest. Wave Crest =the highest point of the wave. Wave Trough = the lowest point of the wave. Wave Height = the distance
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March 7‚ 2014 Chevonne McNish Paper Assignment #1 Philosophy The article: "The Problem of Induction" is understood by the writer Bertrand Russell as: whether the laws of nature that have held in the past will continue to hold in the future. He reflects on our daily subconscious assumptions. Thesis: If we accept Russell’s claims about induction as true‚ there are several consequences we may face. Due to human naiveness‚ we may have been so used to the way things are that‚ if they changed
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insolation Distance between sun and earth holds no effect Phases of the Moon and Eclipses Sidereal and synodic periods Moon shines by reflected light 50% of moon always bright 50% always dark Phases determined by fraction visible Full and new moon; 1st quarter and 3rd quarter; gibbous and crescent; waxing and waning Eclipse umbra- darkest region (of shadow) penumbra- “half-dark” region (of shadow) lunar eclipse- full moon gets dark
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The first landing on the moon was an incredible milestone for humans. It marked the end of the Space Race‚ the creation of advanced technologies‚ and the unification of the USA. The start of the space race saw the Soviet Union take a giant head start over the United States of America with the successful launch of Sputnik‚ a Soviet Union satellite launched on October 4th‚ 1957. The Soviets also launched Sputnik 2‚ which contained a live passenger‚ but the passenger died due to the overheating of the
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Apollo 11 is probably the most famous NASA mission in United States history. The mission that took man to the moon. The mission that made "...one small step for a man‚ one giant leap for mankind" a recognizable phrase throughout every home in America. The mission that captivated not only the nation‚ but the world. The world had recently changed its sights from Imperialism to the vast unknown‚ namely‚ space. It was common knowledge that the USSR was making incredible progress into space exploration
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The city lights stand out like a busy constellation of streets and houses‚ while satellite cars weave their way around the inverted sky. It’s impossible to make sense of‚ except for the main strip which is a single mound of coloured‚ noisy light. I like that the lights don’t seem to get dimmer as they get farther away. They only get smaller and smaller until they slip behind the bends of the maze-like valley. There is a hill to the North of here that looms over the twinkle of the valley
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Chapter 01 The Cycles of the Sky Multiple Choice Questions 1. After a full moon‚ about how long is it until the next new moon? A. A month B. Two weeks C. A week D. Six hours 2. If there is a full moon visible from Paris one evening‚ twelve hours later in Australia there will be a _________ visible. A. Full moon B. New moon C. First quarter moon D. Crescent moon 3. Directly above the Earth’s equator lies the ______________ in the sky. A. North celestial pole B. South celestial pole
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through a pane of glass at a right angle. (c) striking the surface of a prism at a grazing angle from the inside. (d) traveling from one place to another through a vacuum. (e) under no circumstances. 7. The distance from the Earth to the Moon is approximately (a) 3 times Earth’s diameter. (b) 10
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hours Earth revolves 360 around the sun ever 365.24 days= tropical year Earth’s rotation axis precesses every 26‚000 yrs Moon revolves 360 deg ever 27.3 days= Sidereal mon Moon’s cyc repeats every 29.5 days= Syndonic mon Saros cycle: one eclipse yr is only 346 days. 19 eclipse years= 223 syndonic months. LESSON ONE HOMEWORK: 1. You send a message to Buzz Aldrin on the moon‚ 384‚000 km and he sends you an immediate reply. Both messages travel at the speed of light. How long do you have to wait
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