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Earth ,Moon,and Sun - Laconia School District
Earth ,Moon,and Sun - Laconia School District

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... A long time ago, in the second century, There was a Greek astronomer called Claudius Ptolemy. Who came up with a theory called the geocentric model, Which made the Earth the focal point and centre of it all. Centuries went past before some began to doubt. ‘We simply disagree!’ some of the scientists ...
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... competition for the closest result. It is probably best to have the procedure as a floating exercise that could be used at some point in a course when it happens to be sunny. Get the students to rub out their pencil marks on the cards so that they can be reused. The distance to the Sun was first cal ...
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< 1 ... 362 363 364 365 366 367 368 >

Astronomical unit

The astronomical unit (symbol au, AU or ua) is a unit of length, roughly the distance from the Earth to the Sun. However, that distance varies as the Earth orbits the Sun, from a maximum (aphelion) to a minimum (perihelion) and back again once a year. Originally conceived as the average of Earth's aphelion and perihelion, it is now defined as exactly 7011149597870700000♠149597870700 meters (about 150 million kilometers, or 93 million miles). The astronomical unit is used primarily as a convenient yardstick for measuring distances within the Solar System or around other stars. However, it is also a fundamental component in the definition of another unit of astronomical length, the parsec.
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