Chapter1A.History of Astronomy

Chapter1A.History of Astronomy - History of Astronomy...

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1 History of Astronomy Chapter 1
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2 Ancient Astronomy astrology navigation calendar → the “geocentric” perspective
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3
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4
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5 Moon moves toward the east about 13 o daily; the Sun about 1 o .
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6
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7 A(moon) = ½ o
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8 Stonehenge - England
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9
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10 Celestial Sphere
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11 The Celestial Sphere zenith horizon poles (N and S celestial poles) celestial equator circumpolar zones → Latitude = altitude of N.C.P.
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12
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13 The Coordinate System on Earth Longitude measured from an arbitrary time meridian (Greenwich) Latitude measured from equator Poles and equator defined by rotation P
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14 Celestial Coordinates Equivalent to the latitude & longitude system on Earth. Celestial co-ordinates are a projection of the Earth’s system onto the celestial sphere celestial poles : points determined by extending the Earth's axis of rotation to the celestial sphere. celestial equator : projection of the Earth’s equator onto the sky Now, the North Celestial Pole lies near Polaris, the `North Star’ P
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15 The Earth’s Rotational Motion daily circle : the apparent E to W path of a star in the sky during one day due to the the rotation of the Earth around its axis. Daily circles are parallel to the celestial equator. The projection on the sky of the North Pole P
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