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Unformatted text preview: 52 Part 1 Developing Perspective summary of key concepts 2.1 Patterns in the Night Sky What does the universe look like from Earth? Stars and other celestial objects appear to lie on a great celestial sphere surrounding Earth. We divide the celestial sphere into constellations with well-defined borders. From any location on Earth, we see half the celestial sphere at any given time as the dome of our local sky , in which the horizon is the boundary between Earth and sky, the zenith is the point directly overhead, and the meridian runs from due south to due north through the zenith. Why do stars rise and set? Earths rotation makes stars appear to circle around Earth each day. A star whose complete circle lies above our horizon is said to be circumpolar. Other stars have circles that cross the horizon, so they rise in the east and set in the west each day. Why do the constellations we see depend on latitude and time of year?...
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- Spring '08