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Third Grade Astronomy
Third Grade Astronomy

... The Sun, Moon and stars all have properties, locations and movements that can be observed and described. The observable shape of the Moon changes from day to day in a cycle that lasts about a month. The patterns of the stars stay the same although they appear to move across the sky nightly. The Eart ...
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... day • The Earth must rotate an extra 0.986 degrees between solar crossings of the meridian. Therefore in 24 hours of solar time, the Earth rotates 360.986 degrees. • Because the stars are so distant from us, the motion of the Earth in its orbit makes an negligible difference in the direction to the ...
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... • Astronomers use a method called parallax. Because of the Earth's revolution about the sun, near stars seem to shift their position against the farther stars. The smaller the parallax shift, the farther away from earth the star is. This method is only accurate for stars within a few hundred light-y ...
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Earth Science 24.3 The Sun

... Everything we use; from the fossil fuels that run our factories to the food we eat, has somehow come from solar energy. The sun is also important to astronomers, since until recently, it was the only star we could study the surface of. Even with the largest telescopes, most other stars appear only a ...
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Consulting the Planetary Expert: You

... Copernicus in the 1500’s proposed a heliocentric model which had the planets, including Earth, orbiting the Sun. This allowed the motion of all planets to fit the night sky observations almost perfectly. Many people were against this model but slowly this model was accepted. One piece of evidence w ...
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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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