A Complete Collection of 100000 Whys
Fav十万个为什么
为什么冬季白天变短？
1、地球的自转轴与公转轨道平面之间存在一个约23.5度的倾角，这个倾角导致地球在绕太阳公转时，太阳直射点会在南北回归线之间移动。
2、当地球运行到公转轨道的冬季位置时，太阳直射点位于南回归线附近，北半球的太阳高度角降低，日照时间因此缩短。
3、太阳在冬季的轨迹在北半球显得更低，跨越的经度更短，因此每天照射到地球表面的时间减少。
4、冬季时，北半球的白天和黑夜的时长受到地球自转速度和太阳视运动速度的共同影响，自转速度相对稳定，但太阳视运动速度在冬季较慢。
5、地球的轨道并非完美的圆形，而是略呈椭圆形，导致地球在冬季靠近太阳时，公转速度略微加快，但这一效应对白天长短的影响较小。
总之，冬季白天变短是由于地球自转轴的倾角和公转轨道的形状共同作用的结果，北半球在冬季时太阳高度角降低，日照时间自然缩短。
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