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Today we are going to discover how fast Earth is moving and will give you some example of parallaxes related to this topic.
It is not a secret that the motion which is called retrograde motion happens when Earth is “catching up” with another planet in its orbit. For instance, Mars orbits farther from the sun than Earth. At one point in the respective orbits of Earth and Mars, we catch up to the Red Planet and pass it by. As we pass by it, the planet moves backward in the sky. Then it moves forward again after we have passed.
As stated space.com “as an Earthling, it’s easy to believe that we’re standing still. After all, we don’t feel any movement in our surroundings. But when you look at the sky, you can see evidence that we are moving”.
Space.com has introduced a wonderful example describing a simple example of parallax. The sun-centered solar system comes from looking at parallax, or apparent change in the position of the stars with respect to each other.
So, let’s hold up index finger in front of your face at arm’s length. Then look at it with your left eye only, closing your right eye. Then close your right eye, and look at the finger with your left. The finger’s apparent position changes. That’s because your left and right eyes are looking at the finger with slightly different angles. The same phenomenon happens on Earth when we look at stars. It takes about 365 days for us to orbit the sun. So, if we look at a star in the summer, and look at it again in the winter, its apparent position in the sky changes because we are at different points in our orbit.
Now let’s pass on the question how fast Earth is moving.
Earth’s spin is constant, but the speed depends on what latitude you are located at. According to NASA the circumference is roughly 24,898 miles (40,070 kilometers), and the area is also called the equator. If you estimate that a day is 24 hours long, you divide the circumference by the length of the day. This produces a speed at the equator of about 1,037 mph (1,670 km/h). How fast does Earth orbit the sun? Earth’s spin, of course, is not the only motion we have in space. Our orbital speed around the sun is about 67,000 mph (107,000 km/h), according to Cornell. We can calculate that with basic geometry.
Source: Text, Image Credit; space.com
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