solar day

例句：

1. 1. The solar system is composed of the sun and all the planets orbiting it.
   太阳系由太阳和绕其运行的所有行星组成。
2. 2. Solar energy is a renewable source of power that can be harnessed for both electricity and heating.
   太阳能是一种可再生的能源，可以用于发电和供暖。
3. 3. During the summer solstice, the days grow longer and the nights shorter.
   在夏至期间，白天变长而夜晚变短。