For many years it was believed the Earth was the center of the Universe. Alas, this was disproved for a number of reasons including the fact the planet was moving quickly through space.
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Once our egotistical view of being the center of the universe was disproved, the goal of figuring out how fast we are moving through space came front and center. These days, the rather interesting answer is there are three different speeds. No, the planet doesnt move at different speeds. It is more a matter of perspective and how we define movement. The issue comes down to whether we measure the orbit as a matter of time or pure acceleration.
The speed of the Earth is defined three ways. The sidereal methodology calculates the orbit speed for one revolution around the sun in relation to the sun and stars and is a measure of time. The tropical year is also a measure of time, but refers to how long it takes one point on the earth to make a revolution around the sun between two equinoxes. Finally, the pace can also be calculated in good old miles per hour.
While we consider a day to be 24 hours, it is actually a bit less because the...
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