My Art of Astronomy: Why Does the Moon Change Shape? (Part 13)
art·@senseye·
0.000 HBDMy Art of Astronomy: Why Does the Moon Change Shape? (Part 13)
<html> <p>You have probably noticed that the Moon does not always look the same. Its shape changes over the course of a month. We either see a thin sickle shape, or a half circle, or a full Moon. Sometimes we cannot see the Moon at all. Why?</p> <p>The Moon itself does not shine. We can see it only because it is lit by the Sun. The Sun shines on one half of the Moon and the other half is in darkness. The Moon is the Earth's satellite. It takes one month for it to travel around the Earth.</p> <p>When the Moon is in the position as shown in drawing, on the right, then only the edge of the bright half of the Moon is visible on Earth. We see a thin sliver.</p> <p><center><img src="https://s9.postimg.org/nuj7x3vhr/moon_phase_1.jpg"></center></p> <p>Each day the sliver gets larger. The Moon seems to be growing. When the Moon is lit up from the side, we see half of the bright side.</p> <p><center><img src="https://s15.postimg.org/t87rblwsr/moon_phase_2.jpg"></center></p> <p>As the Moon moves around the Earth it reaches the side of the Earth which is away from the Sun.</p> <p><center><img src="https://s15.postimg.org/pufo8sy6z/moon_phase_3.jpg"></center></p> <p>Then we see the entire bright side and it looks round. When the Moon moves farther along, it will be lit from the side again. But this time the other side.</p> <p><center><img src="https://s21.postimg.org/51wa2t01z/moon_phase_4.jpg"></center></p> <p>Later we see the narrow sliver again, but turned to the other side.</p> <p><center><img src="https://s12.postimg.org/7ronqqzm5/moon_phase_5.jpg"></center></p> <p>Each day the Moon gets narrower and narrower. It is disappearing.</p> <p>When the Moon is between the Earth and the Sun the dark side is turned toward us and we cannot see the Moon at all.</p> <p><center><img src="https://s17.postimg.org/dywab26gv/moon_phase_6.jpg"></center></p> <h3>This happens each month. These changes are called lunar phases.</h3> </html>
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