地理2（Geography 2）.doc

地理2（Geography 2） The examination, high geography information will never fail the exam. Unit 1 earth in the universe I. The basic forms of the earth motion: revolution and rotation Revolve around the center of the suns axis Direction: from west to East (over the north pole, counterclockwise, opposite Antarctica) Period: sidereal year (365 days, 6 hours, 9 minutes, 10 seconds) sidereal day (23:56 4 seconds) Angular velocity: the average of 1ordm / day; perihelion (early January) (early July) slow fast aphelion around equal 15ordm per hour (except the poles); Linear speed: average 30 km / h, decrease from equator to polar, Equatorial 1670KM\ hour, polar 0. The relation between the rotation of the earth and revolution: (1) the obliquity angle: the equatorial plane and the plane of the ecliptic. Its 23o 26 (2) the direct motion of the sun between the Tropic of cancer Two: the geographical significance of the rotation of the earth (1) day and night change (2) local time (3) deviation along the surface horizontal movement, the northern hemisphere is right, the southern hemisphere left Three: the geographical significance of the revolution of the earth (1) the length of day and night and the change of solar altitude at noon Changes in the length of day and night The northern hemisphere: the summer half year, the more North day longer the sun in the hemisphere, North of the Arctic Circle appear light phenomenon the hemisphere that day long, the equator throughout the year Winter is half a year, the days are short and the nights are long, the more northerly, the shorter the days, the days and nights are equal North of the Arctic Circle appear dark equinox phenomenon Southern Hemisphere: Contrary to the Northern Hemisphere Change of solar altitude at noon Spring and autumn days: from the equator to the north-south direction, from the direct point of the sun to the north and South With the change of latitude, the summer solstice date decreases from north to south by 23o 26 N Wi