l> What are the phases of the Moon? les-grizzlys-catalans.org Question of the Month for November 1998Question: What are the phases of the Moon?Answer:The Moon orbits Earth at an average distance of 382,400 kilometers. Thelunar month is the 29.53 days it takes to go from one new moon to the next.During the lunar month, the Moon goes through all its phases. You can see the phases drawn in the image below. Just like the Earth, half of the Moon is lit by the Sun while the other half is in darkness. The phases we see result from the angle the Moon makes with the Sun as viewed from Earth. The diagram below on the right is one you typically see in books. Don"t let it confuse you. The images of the Moon show what you see the Moon look like from Earth when it is at given points in its orbit. It does not show which side of the Moon is lit by the Sun. The side lit by the Sun is always the side that is pointed toward the Sun, as seen in the diagram below on the left.
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We only see the Moon because sunlight reflects back to us from its surface.During the course of a month, the Moon circles once around the Earth. If wecould magically look down on our solar system, we would seethat the half of the Moon facing the Sun is always lit.But the lit side does not always face the Earth! As the Moon circles theEarth, the amount of the lit side we see changes. These changes are knownas the phases of the Moon and it repeats in a certain way over and over. At new moon, the Moon is lined up between the Earth and the Sun. We see the side of the Moon that is not being lit by the Sun (in other words, we see no Moon at all, because the brightness of the Sun outshines the dim Moon!) When the Moon is exactly lined up with the Sun (as viewed from Earth), we experience an eclipse.As the Moon moves eastward away from the Sun in the sky, we see a bit more of the sunlit side of the Moon each night. A few days after new moon, we see a thin crescent in the western evening sky. The crescent Moon waxes, or appears to grow fatter, each night. When half of the Moon"s discis illuminated, we call it the first quarter moon. This name comes from thefact that the Moon is now one-quarter of the way through the lunar month. FromEarth, we are now looking at the sunlit side of the Moon from off to the side.The Moon continues to wax. Once more than half of the disc is illuminated,it has a shape we call gibbous. The gibbous moon appears to grow fattereach night until we see the full sunlit face of the Moon. We call thisphase the full moon. It rises almost exactly as the Sun sets and sets just as the Sunrises the next day. The Moon has now completed one half of the lunar month. During the second half of the lunar month, the Moon grows thinner each night. We call this waning. Its shape is still gibbous at this point, but grows a little thinner each night. As it reaches the three-quarter point inits month, the Moon once again shows us one side of its disc illuminated and the other side in darkness. However, the side that we saw dark at the first quarter phase is now the lit side. As it completes its journey andapproaches new moon again, the Moon is a waning crescent. Want another description of why the Moon has phases?You can demonstrate the phases of the Moon for yourself by using a lamp anda baseball. Place the lamp with its shade removed in one end of a darkenedroom. Sit in the other end of the room and hold the baseball up in front ofyou so that it is between your face and the lamp. Now move the ball aroundyour head at arm"s length. Do this slowly and move your arm from right toleft. As the baseball orbits your head, you will see it go through the samephases as the Moon. Want to know what phase the Moon is in right now?


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