202 Lecture 3

202 Lecture 3 - Lecture 3 Earth's Motions Basic Motions o...

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Lecture 3: Earth’s Motions. Basic Motions: o Daily rotation (24 hours) o Yearly revolution (365.25 days) o Precession of equinoxes (26,000 years) o Oscillation of tilting axes (41,000 years) o Change in the shape of the orbit (100,000 years) Day and Night: o At any time, Daytime in Half of the Earth. o Places on the Earth face directly the Sun when sun crosses meridian (noon). o Opposite places on Earth Midnight. o Earth rotates around imaginary axis going through North and South poles. o Alternation of Day and Night result of rotation. o Clockwise rotation of the Earth (as seen from North Pole) Apparent East to West motion of Stars. o Stars can only be seen at night, when facing away from the Sun. o Length of day Sidereal Day: One complete rotation, measured with respect to fixed stars 23 hours, 56 minutes, 4 seconds Apparent Solar Day: From Noon to Noon. 24 hours Revolution about Sun changes Earth-Sun orientation each day. Revolution:
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202 Lecture 3 - Lecture 3 Earth's Motions Basic Motions o...

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