Wednesday, February 22, 2023

Can you see Earth spin?

If Earth didn't spin, there would be no sunrise and sunset, and no night and day. We can't feel the motion of Earth's rotation or see the planet spin as we go about our daily lives. But are there ways to confirm its rotation from the ground? And is it possible to watch our planet spinning from somewhere in space?
 
The answer depends on the time frame and your perspective.
Earth spins much too slowly for its rotation to be visible from anywhere in real time. With the exception of a time-lapse video — such as this one from NASA, which was made with footage from a camera on the International Space Station — it is not possible to watch Earth in motion because it makes only one revolution every 24 hours. That is excruciatingly slow — much too slow for our eyes to detect. 
However, there are still ways to prove our planet spins without ever leaving terra firma: by observing the positions of other objects in the sky, for instance.
"The easiest way to observe Earth's rotation is by watching the apparent motion of celestial bodies," Stephen Merkowitz, a scientist and project manager at NASA's Goddard Space Flight Center in Maryland, told Live Science in an email. "This motion is most noticeable when the body is close to the horizon where you have parts of the Earth in view as a reference."
Can you see Earth spin?

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