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Celestial Motions
Celestial Motions

... The Greeks knew that the lack of observable parallax could mean one of two things: 1. Stars are so far away that stellar parallax is too small to notice with the naked eye. 2. Earth does not orbit Sun; it is the center of the universe. With rare exceptions, such as Aristarchus, the Greeks rejected ...
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... The Sun is a star found at the centre of our Solar System. It makes up around 99.86% of the Solar System’s mass. The light from the Sun takes around 8 minutes to reach the Earth. Other stars may be larger, brighter, smaller or fainter than our Sun but they are so very far away that we only see them ...
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... are solid bodies which, unlike the stars, do not have their own light, but receive the same from the Sun. Obviously the planets that are closest to the Sun are those with the highest temperature, and those which are further away from the Sun, instead, are colder. The planet we live on is the Earth. ...
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GSC 1580 Vocabulary/Who`s Who

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... 2. Why are light-years more convenient than miles, kilometers, or astronomical units for measuring certain distances? 3. The diameter of Earth is 7928 mi. What is its diameter in inches? In yards? 4. 1 astronomical unit is about 150,000,000 km. Venus orbits 0.7 AU from the sun. What is that distance ...
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Lunar theory

Lunar theory attempts to account for the motions of the Moon. There are many irregularities (or perturbations) in the Moon's motion, and many attempts have been made to account for them. After centuries of being problematic, lunar motion is now modeled to a very high degree of accuracy (see section Modern developments).Lunar theory includes: the background of general theory; including mathematical techniques used to analyze the Moon's motion and to generate formulae and algorithms for predicting its movements; and also quantitative formulae, algorithms, and geometrical diagrams that may be used to compute the Moon's position for a given time; often by the help of tables based on the algorithms.Lunar theory has a history of over 2000 years of investigation. Its more modern developments have been used over the last three centuries for fundamental scientific and technological purposes, and are still being used in that way.
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