仔细阅读《世界政区图》、《世界地形图》后,发现北回归线自西向东穿越了非洲北部地区、亚洲的阿拉伯半岛和印度半岛地区及亚洲的东部(中国的东部和南部)地区。然而,这些地区的气候、生物和人种却截然不同。一、北回归线上的气候众所周知,任何一个地方的气候都是由太阳辐射、大气环流、海陆位置、地面状况及人类活动等综合作用形成的。地球在不停地自转的同时又在不停地公转。有自转,就有赤道平面;有公转,就有轨道平面,即黄道平面。在赤道平面 After carefully reading the “World Administrative Map” and “World Topographic Map”, it was discovered that the Tropic of Cancer crosses the northern part of Africa, the Arabian Peninsula and the Indian Peninsula of Asia, and the eastern part of Asia (the east and the south of China) from west to east. However, the climate, biology and people of these regions are quite different. First, the climate of the Tropic of Cancer is well-known. The climate in any place is formed by the combined effects of solar radiation, atmospheric circulation, land and sea locations, ground conditions, and human activities. The earth is constantly revolving while it is still spinning. If there is rotation, there will be an equatorial plane; if there is a revolution, there will be an orbital plane, that is, the ecliptic plane. At the equatorial plane