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Solar System Fundamentals
Solar System Fundamentals

... • All other bodies in the Solar system are called SSSB’s – Small Solar System Bodies • These include: – Minor Planets or Asteroids – Kuiper Belt Objects (KBO’s) also known as Trans Neptunian Objects (TNO’s) – Comets ...
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... turn off. Earth is always rotating on its axis, so the Sun appears to move across the sky. At sunrise, the Earth’s rotation brings our homes into sunlight. By midday, the Earth has rotated so the Sun is high in the sky. At sunset, the Earth rotates so that the Sun goes below the horizon. During the ...
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... turn off. Earth is always rotating on its axis, so the Sun appears to move across the sky. At sunrise, the Earth’s rotation brings our homes into sunlight. By midday, the Earth has rotated so the Sun is high in the sky. At sunset, the Earth rotates so that the Sun goes below the horizon. During the ...
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... On the morning of Friday 20th March 2015 a partial solar eclipse will be visible from the whole of the UK. Solar eclipses are quite rare and this will be a major event, with the Moon passing in front of the Sun and covering a large portion of the solar disc. This will be an event you will remember f ...
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< 1 ... 320 321 322 323 324 325 326 327 328 ... 369 >

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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