地理重要知识点（Geography is an important knowledge point）.doc

地理重要知识点（Geography is an important knowledge point） Geography requires a knowledge point Unit 1 the earth in the universe The basic form of the earth movement: revolution and rotation Around the center of the sun From west to east (counterclockwise over the North Pole) Periodic star days (365 days, 6 hours, 9 minutes, 10 seconds) star day (23556 minutes and 4 seconds) The angular velocity average 1o/day perihelion (at the beginning of January) is almost the same everywhere, at 15o per hour (except at the poles). The linear velocity is averaging 30 km/h from the equator to the poles, and the equator is 1670KM/h, which is extremely 0. The relationship between rotation and revolution of the earth: (1) the intersection of the equatorial plane and the ecliptic plane. Now is 23 o26 (2) the direct line of the sun moves between the tropic of Capricorn Two: the geographical significance of the earths rotation (1) when the (2) local time (3) moves in the horizontal motion of the surface of the earth, the right side of the northern hemisphere, the left of the southern hemisphere. Three: the geographical significance of earth revolution (1) changes in the length of day and night and the height of the sun The change of day and night Northern hemisphere: in the summer months, the days and nights are short, and the longer the days are, the longer the sun shines in that hemisphere. The northern hemisphere of the Arctic Circle is the day long, the equator year In the winter half year, the day and the short night long, the more the north day, the shorter day and night share, the equinoxes equinoxes the world The polar night of the Arctic Circle is split between night and night Southern hemisphere: opposite to the northern hemisphere The high noon changes in the sun Equinoctial period: from the equator to the north and south from the sun direct point to the north and south Summer solstice: from 23o26 n to lower north and south Winter solstice: from 23o26 S to north and south The maxim