我们生活居住所在的行星——地球,虽然不是太阳系里唯一有生命现象的星球,但差不多可以说是唯一有人类活动的星球。地球上一切动力来源,能量的获得,都是和太阳分不开的,所以人类及一切生物的生活状况莫不和太阳息息相关而受着太阳的极大影响。既然如此,那末太阳和地球的相对位置也必然影响到地球上的每一种活动。一般说,太阳对我们的位置有两种显著变化。一种是由於地球自转,使我们觉得太阳在东升西落,造成昼夜交替的现象,产生时间的单位——日。另一种是因为地球环绕太阳公转,但地球自转轴并不垂 The planet Earth where we live, though not the only planet in the solar system with life phenomena, is almost the only planet with human activity. All the sources of energy and energy on earth are inseparable from the sun. Therefore, the living conditions of humans and all living things are closely related to the sun and greatly affected by the sun. In this case, the relative position of the sun and the earth will inevitably affect every activity on the earth. In general, the sun has two significant changes in our position. One is that because of the rotation of the earth, we feel that the sun is rising in the east and the west, causing the phenomena of alternating day and night, and the unit of time - the day. The other is because Earth orbits the Sun, but the axis of Earth’s rotation does not