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一、自然事物和现象1.地球公转速度1月初,地球位于公转轨道的近日点,此时公转速度最快;7月初,地球位于公转轨道的远日点,公转速度最慢。地球在公转轨道不同位置时公转速度的变化如表1所示。如图2所示,夏半年,太阳直射北半球,全球(除极昼、极夜地区外)日出东北、日落西北,刚好出现极昼的地区日出正北、日落正北。冬半年,太阳直射南半球,全球(除极昼、极夜地区外)日出东南、日落西南,刚好出现极昼的地方则日出正南、日落正南。
First, the natural things and phenomena 1. Earth revolution speed In early January, the Earth is located in the orbit of recent days, when the fastest revolution; early July, the Earth is located in the orbit of the far point, the slowest revolution. Table 1 shows the change of revolution speed of the earth at different positions of revolution orbit. As shown in Figure 2, in the summer of the year, the sun shines directly on the northern hemisphere, and the whole world (except the polar day and the polar night area) sunrise northeast, sunset northwest, just appeared the polar day sunrise northeast, sunset north. In the winter half year, the sun shines directly in the southern hemisphere. The world (excluding the polar day and the polar night area) southeast at sunrise, southwest at sunset, and at sunrise just south of the sunshine and south at sunset.