论文部分内容阅读
四季知识主要分布在以下方面: 天文方面:太阳直射点的移动;太阳高度的变化;昼夜长短的变化;天文四季的定义;地球在公转轨道上的位置;北斗七星斗柄的朝向;极昼、极夜、极光现象的出现等。水文方面:河流汛期;河流补给;河流封冻、解冻的时期及冰期、凌汛的出现;季风洋流等。气候方面:气团活动、锋面活动及特殊天气的产生;气温中心的变化;气压中心的盛衰;季风方向的变
The four seasons of knowledge are mainly distributed in the following areas: Astronomical aspects: movement of the direct sun point; changes in the height of the sun; changes in the length of day and night; the definition of astronomical seasons; the position of the Earth in orbit; the orientation of the handle of the Big Dipper; extremely polar, polar The appearance of night and aurora phenomenon. In terms of hydrology: river flood season; river supply; the period of freezing and thawing of rivers, and the occurrence of ice age and turbulence; monsoon currents, etc. Climate: air mass activity, frontal activity and special weather; change of temperature center; rise and fall of air pressure center; change of monsoon direction