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四季的产生

What Causes Seasons?

四季是如何产生的?
What causes seasons?
四季鲜明的特点 在于均温与昼夜长
Seasons are broadly characterized by the difference in average temperature and the length of day
的不同
or night.
直观地说 地日距离的不同会造成季节不同
Intuitively, it may seem that the varying distance of Earth from Sun causes seasons.
但事实上 地日距离的最大差值只有3%
But in fact, the maximum difference of this distance is just about 3%.
季节的真正成因在于地轴相对于旋转面的倾斜程度
The real cause of seasons is the tilt of Earth’s rotational axis relative to the plane of revolution.
当北半球斜向太阳时 北半球昼更长
When the Northern Hemisphere is tilted towards the Sun, it has longer days, receives more
获得的太阳辐射更多 光线更多是直射的
of the Sun’s rays and the Sunlight hits more directly.
这大概发生在每年的六月 此时北半球为夏季
This happens around June of every year when the Northern Hemisphere has summer and Southern
南半球为冬季
hemisphere has winter.
相反 在十二月左右 北半球远离太阳 因此
Conversely, around December, Northern hemisphere is tilted away from the sun, thus experiencing
便进入了冬季
winter.
极点距太阳最远或最近的极端状况
These extremes, when the poles are either farthest or closest to the Sun, are called
被称为两至点 此时我们会经历最长的昼或夜
Solstices when we have the longest days or nights.
在三月末 南北半球距日距离相等
During late March, both the hemispheres are at equal distance from the Sun, and thus have
因而此时地球昼夜平分
equal length of day or night.
这被称为春分 它标志着北半球春天
This is called an equinox and it marks the beginning of spring for Northern hemisphere
与南半球秋天的开始
and autumn for Southern hemisphere.
同样 在九月末 还有一个秋分来划分另外两个季节
Similarly, in late September we have another equinox heralding the other two seasons.
注意 两至点并非位于地日距离最近
Note that Solstices are not the positions when Earth is closest or farthest from the
或是最远处
Sun.
事实上 日地距离在一月达到最近
In fact Earth is closest to the Sun in January.
而且 倾斜角在一年里是恒定的 它要过很长一段时间才会改变
Also, the axial tilt which is constant throughout a year, does change over long periods of time.

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四季到底是如何产生的呢?你知道么?一起来看看吧

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视频来源

https://www.youtube.com/watch?v=l1WgJl5OAeE

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