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上文简述了十二星座对应的日子和俺的观点，本文则继续以补充基础知识为主，聊聊地球公转和人格类型的事情。
三、地球公转的四个象限变化
众所周知，地球公转的轨迹，是以太阳为一个焦点的椭圆，夏至是接近远日点的，而冬至是接近近日点的。根据能量守恒，在夏至的时候，地球的动能小，角速度、线速度慢；冬至则是角速度、线速度均比较大。参照前文的两张图，先将地球公转分成四个象限：
第一象限：春分到夏至；
第二象限：夏至到秋分；
第三象限：秋分到冬至；
第四象限：冬至到春分。
便可得出如下结论：在第一象限地球的角速度(u)、线速度(v)是由大变小；在第二象限是由小变大；在第三象限是由小变大；在第四象限是由大变小。需要注意的是：远日点和近日点分别通常是7月4日和1月4日，这样，第二象限前半个月，u、v依然是由由大变小；同理，第四象限前半个月依然是由小变大的——其实这也是符合惯性定律的。
此外，春分、夏至、秋分、冬至四个节点分别是昼夜时间长短变化的分割。可得：第一象限太阳直射点北移；第二象限直射点南移；第三象限直射点南移；第四象限直射点北移。
进而，结合前文的内容可有如下结果：位于一、四象限的摩羯座、水瓶座、双鱼座、白羊座、金牛座、双子座，大致经历着u、v渐小，直射点北移；位于二、三象限的巨蟹座、狮子座、处女座、天秤座、天蝎座、射手座则与之相反。
四、人的性格基本属性
既然星座发源于西方，我们自然要引用一些西方心理学的基础知识了。请大家将手中的《心理学与生活》翻到第387页，希腊医生希波克拉底将人的性格根据体液分成：多血质、粘液质、抑郁质、胆汁质。每种类型特点如下：
多血质：快乐，好动
粘液质；缺乏感情，行动迟缓
抑郁质：悲伤，易哀愁
胆汁质：易激怒，易兴奋
进入现代社会，体液论被淘汰了——虽然它流传时间很久——艾森克将外向性和神经质两个维度组合成一个环状图形，每一个象限代表希波克拉底的四种体液质。
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