December 6, 2010
A sidereal day is approximately 23 hours, 56 minutes, 4.091 seconds. That corresponds to the time it takes the Earth to complete one rotation relative to the vernal equinox. Since the vernal equinox precesses (every 26,000 years) in a westward direction relative to the fixed stars, the sidereal day is some 0.008 seconds shorter than [...]
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September 26, 2010
Among the many things we seek to understand about the Earth is how it moves. This is important since it orbit and rotation affect many important aspects of life on planet Earth. Earth’s solar orbit determines the length of our year and the rotation of the earth gives us the day and night that helps [...]
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