Polaris is called the Pole Star or North Star because it apparently remains in the same place in the sky: almost exactly above the North Pole, night after night. Face Polaris and you will be facing north. Thus, to your right is east, to your left is west, and directly behind you is south. Observe the sky for a period of time and you will find that from night to night some stars appear in the sky all year, while others are seasonal. These stars are part of constellations called circumpolar constellations, because they move in circular paths around Polaris, the Pole Star. Like horses on a carousel, the stars spin around a center point but still stay in line with one another. Thus, the shapes of constellations do not change even though they appear in different places during the night and on different nights of the year. From latitudes of 40°N or greater, the four most visible northern circumpolar constellations are Ursa Major, Ursa Minor, Cassiopeia, and Cepheus. You Did It! Congratulations! You have made a model of the movement of northern circumpolar constellations. The apparent counterclockwise movement of these stars around Polaris is actually due to the clockwise rotation of Earth about its axis. Earth not only rotates on its axis, but also changes position in the sky in relation to the stars as it revolves around the Sun. Earth's movement around the Sun causes a slight change in the southern part of the sky seen each day. This results in different stars being visible during each season. But Earth's North Pole continues to point toward Polaris, so the northern circumpolar stars remain the same during the year.
✔ Author(s): Janice VanCleave
✔ Title: Janice VanCleave's Big Book of Science Experiments
✔ Rating : 4.6 out of 5 base on (160 reviews)
✔ ISBN-10: 1119590655
✔ Language: English
✔ Format ebook: PDF, EPUB, Kindle, Audio, HTML and MOBI
✔ Device compatibles: Android, iOS, PC and Amazon Kindle
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