Why Do We See The Same Side Of The Moon From Earth
Camila Farah
Simply said because the moon s rotation coincide with its orbit around the earth we only see the same surface of the moon.
For starters the moon is not stuck in place with one side facing us. It s just that the amount of time it takes the moon to complete a revolution on its axis is the same it takes to circle our planet about 27 days. From earth we always see nearly the same face of the moon. And second the moon s rotation axis is not at right angles to its orbit around the earth so we can sometimes see over or under its poles.
We only ever see one side of the moon because as it orbits around earth it also rotates on its own axis at the same speed. There s no such thing as a permanently dark side of the moon. The side facing away from the sun is in shadow. The sun shines on one half of the moon.
The moon is directly illuminated by the sun and the cyclically varying viewing conditions cause the lunar phases. If you had a moon base you would spend 14 days in sunshine and 14 days in darkness. This happens because the moon rotates on its axis in the same amount of time it takes to orbit earth a trait called synchronous rotation. There are two main reasons for this.
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Our lunar companion rotates while it orbits earth. But why 59 percent and not 50 percent. The whole earth sees the same moon phase on the same day but the northern and southern hemispheres see the moon oriented differently with respect to the horizon. Well this is due to the fact that the moon s orbit is elliptical and not circular.
As a result the same lunar hemisphere always faces earth.
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