Chapter 2 - Constellation: is a region of the sky with...

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Constellation: is a region of the sky with well-defined borders. Celestial sphere: Greeks believed that all stars line on this sphere that surrounds the earth. Celestial Equator: Projection of earth's equator into space, makes a complete circle around the celestial sphere. Ecliptic: The path the sun follows. Widest and brightest part of the milky way is seen easily in the southern hemisphere. The band of light on the Milky Way traces out galaxy's disk of stars as it appears from our location in the outskirts of the galaxy Local Sky: The sky as seen from wherever you happen to be standing on Horizon: The band between the earth and the sky Zenith: The point directly overhead. Angular size: the angle it appears to span in your field of view. It depends on distance the farther away an object is, the smaller it will look in angular size. Angular Distance: between a pair of objects in the sky is the angle that appears to separate them. Why Do stars Rise and Set? Because the earth rotates, not the rest of the universe, and that is why the sun, moon, planets, and stars move across our sky each day -But stars near the north celestial pole remain above the horizon which are known as circumpolar. Same with stars near the south celestial pole, the will never rise above the horizon. -All the other stars have daily circles and are partly above the horizon and partly below
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Chapter 2 - Constellation: is a region of the sky with...

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