楼主，你好：In the world, not only has the alternation of day and night, and the seasons change phenomenon, and the north and South Hemisphere seasons just the opposite. When we here is the heat of summer, perspiration came down like raindrops. Season, while the southern hemisphere is in the wind, snow conditions!
Why on earth would have the four seasons change phenomenon?
Four seasons because of the formation of the earth around the sun results. The earth has been 's rotation from west to East, and at the same time around the sun. But the earth 's orbit is an elliptical shape, the sun is always a focus located on. In the revolution of the earth in the process, the earth's axis and orbit will always keep 66degrees 34 ' angle, that the earth is always leaned in and around the sun. Because of the revolution of the earth causes, causing the earth to change.
To every year around June 22nd, the earth is located at aphelion. The sun will direct the Tropic of cancer, this day is the northern hemisphere summer solstice. At the same time the northern hemisphere receives highest heat, the longest, and the climate was hot, which belongs to the northern hemisphere summer, but the southern hemisphere is in cold winter.
Since then because of continued in orbit and keep on running, the direct sun turns southward. By September 23rd, the sun will direct the equator, this day is a day of autumnal equinox in the northern hemisphere. Now the southern hemisphere and the northern hemisphere gets the heat of the sun are all equal, equinox, the northern hemisphere is the autumn, the southern hemisphere 's spring.
The earth to continue running, until around December 22nd, the earth started at perihelion, the sun is point-blank capricorn. This day is the northern hemisphere's winter solstice. While the northern hemisphere gets the heat for at least a day, and the shortest time, climate is quite cold, it is winter in the northern hemisphere. The southern hemisphere 's summer.
Subsolar point back to the north, around March 21st, the sun again directly at the equator, this day is the northern hemisphere vernal equinox day. This time, the northern hemisphere's spring, while the southern hemisphere is autumn. The earth like an annual cycle around the sun non-stop operation, resulting in a change of seasons.
中文意思是：在世界各地，不但有昼夜交替现象，而且有四季变化现象，并且南北半球的四季变化刚好相反。当我们这里正是夏日炎炎、挥汗如雨的季节，而南半球却处在寒风凛冽、大雪纷飞的情况哩!
为什么地球上会有四季交替变化现象呢?
四季的形成是因为地球绕太阳公转的结果。地球一直不断自西向东自转，与此同时又绕太阳公转。而地球公转的轨道又是一个椭圆的形状，太阳始终位于一个焦点上。地球在不断公转的过程中，地轴与公转轨道始终会保持66°34′的交角，即地球始终是斜着身子绕太阳公转。因为地球公转的原因，致使太阳直射点在地球表面发生变化。
到了每年6月22日前后，地球就是位于远日点。太阳会直射北回归线，这一天就是北半球的夏至日。与此同时北半球得到的热量最高，白昼最长，而且气候也炎热，属于北半球的夏季，但南半球正处于寒冷的冬季。
此后因为继续在公转轨道上不停运行，太阳的直射点便会南移。到了9月23日左右，太阳就会直射赤道，这一天就是北半球的秋分日。现在南半球以及北半球得到的太阳热量都相等，昼夜平分，北半球是秋季，南半球是春季。
地球继续不断运转，到12月22日左右，地球开始位于近日点，太阳便直射南回归线。这一天就是北半球的冬至日。而此时北半球得到的热量为最少，且白昼时间最短，气候也相当寒冷，是北半球的冬季。南半球刚好是夏季。
太阳直射点北返以后，在3月21日左右，太阳再次直接射向赤道，这一天就是北半球的春分日。这个时候，是北半球的春季，而南半球却是秋季。地球像这样以一年为周期绕太阳不停运转，从而产生了四季的更替。
希望对你有帮助，祝你学习进步哦！ 望采纳~！
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