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Tolbert3 - Astronomy September 2, 2008 Lecture 3 Zenith,...

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Astronomy September 2, 2008 Lecture 3 Zenith, nadir, and horizon are different (more or less) for everyone on earth. Constellations- groupings of stars that make up some pattern as seen from earth. In the 1800s, there were regions of the southern sky that didn’t have ancient constellations in them. Big dipper- asterism. Different from constellation. A named group of stars within a constellation. Other objects that move relative to celestial sphere- the sun, the moon, mercury, venus, mars, Jupiter, Saturn. These moving objects were called planets, and planet means “wandering star.” Today, the sun and the moon are not called planets. Ecliptic- the path of the sun through the stars during the year, or the path the earth actually takes around the sun. o The zodiac is the strip the planets move, close to the ecliptic. o Ecliptic makes a complete circle completely around the celestial sphere. Another circle is the celestial equator.
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Tolbert3 - Astronomy September 2, 2008 Lecture 3 Zenith,...

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