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Create your free OpenLearn profile. Course content Course content. Moons of our Solar System Start this free course now. Free course Moons of our Solar System. Download this video clip. Skip transcript Transcript. Well, in my left hand, I have a feather. In my right hand, a hammer. But I guess one of the reasons we got here today, was because of a gentleman named Galileo, a long time ago, who made a rather significant discovery about falling objects in gravity fields.
And we thought that where would be a better place to confirm his findings than on the moon. And the feather happens to be, appropriately, a falcon feather, for our Falcon. Show transcript Hide transcript. Interactive feature not available in single page view see it in standard view. Previous 2.
Next 2. Take your learning further Making the decision to study can be a big step, which is why you'll want a trusted University. In English, we can easily recognize the names Sun-day Sunday , Moon-day Monday , and Saturn-day Saturday , but the other days are named after the Norse equivalents of the Roman gods that gave their names to the planets. In languages more directly related to Latin, the correspondences are clearer.
There is no reason that the week has to have seven days rather than five or eight. The time interval in which the phases repeat—say, from full to full—is the solar month , The Moon must make more than a complete turn around the moving Earth to get back to the same phase with respect to the Sun. As we saw, the Moon changes its position on the celestial sphere rather rapidly: even during a single evening, the Moon creeps visibly eastward among the stars, traveling its own width in a little less than 1 hour.
The delay in moonrise from one day to the next caused by this eastward motion averages about 50 minutes. The Moon rotates on its axis in exactly the same time that it takes to revolve about Earth. As a consequence, the Moon always keeps the same face turned toward Earth Figure 2. Start by facing your roommate. Figure 2: The Moon without and with Rotation.
In this figure, we stuck a white arrow into a fixed point on the Moon to keep track of its sides. The back side is dark no more frequently than the front side. Since the Moon rotates, the Sun rises and sets on all sides of the Moon. The full moon is visible in the sky only during the night; other phases are visible during the day as well. Because its period of revolution is the same as its period of rotation, the Moon always keeps the same face toward Earth.
Skip to main content. Earth, Moon, and Sky. Search for:. Phases and Motions of the Moon Learning Objectives By the end of this section, you will be able to: Explain the cause of the lunar phases Understand how the Moon rotates and revolves around Earth. Astronomy and the Days of the Week The week seems independent of celestial motions, although its length may have been based on the time between quarter phases of the Moon.
View this animation to see the phases of the Moon as it orbits Earth and as Earth orbits the Sun. Licenses and Attributions.
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