North Celestial Pole Polaris celes South Celestial Pole ChapterPatt The stars look as if they are...

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North Celestial Pole Polaris celes South Celestial Pole

ChapterPatt The stars look as if they are attached to a sphere that surrounds the earth, the Celestial Sphere. We now know that stars are really at different distances from the Earth, but we still use the Celestial Sphere model as a convenient map of the stars. The Celestial Sphere appears to rotate from East to West, carrying each star completely around in slightly less than 24 hours. The time for one rotation is called a sidereal day and is 4 minutes less than 24 hours. We now know that it is the Earth rotating on its axis and moving around the Sun that makes the Celestial Sphere seem to rotate. Constellations A fixed pattern of stars is called a constellation. The Big Dipper, shown here, is part of the constellation Ursa Major

These patterns are partly illusions because stars that look close together in the sky may be at very different distances from us. Later we will discuss how these distances can be measured, but here are the known distances for the stars of the Big Dipper Distances in Light Years -123 86 58 478 80 83 104 he Stars Earths Ais Notice that the end stars, at 104 light years and 123 light years, are farther away than the rest. The stars in the middle of the pattern really are grouped together in space, but the end stars are just in the background. Although these are relatively close stars, the light from them started on its journey to us before most of us were born

The stars, as seen from the Earth, appear to be attached to O A the Celestial Sphere, a sphere that surrounds the Earth. 0 B the top of the Earths atmosphere. C the Celestial Net, a mesh of wires surrounding the Earth. O D the Heliopause, an off-center surface surrounding the Sun. OE the North Celestial Pole

The time it takes for the Celestial sphere to rotate once relative to the Earth is called O A a solar day OB a sidereal day Ocan astronomical day. O D a Celestial day OE a polar day

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Answer 1

Answer #1

1- The celestial sphere, a sphere that surrounds the earth

2- A sidereal day, which is 4 hours less than 24 hours the time taken by earth to complete one rotation around its axis.

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Answer 2

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