The atmosphere is divided vertically into four layers based on temperature: the troposphere, stratosphere, mesosphere, and thermosphere. Throughout the Cycles unit, we'll focus primarily on the layer in which we live-the troposphere. Troposphere. The word troposphere comes from tropein, meaning to turn or change.
For example, the conventional date 1644 marks the year in which the Qing dynasty armies replaced the preceding Ming dynasty according to the dynastic cycle. However, the Qing dynasty was established in 1636 (or even 1616, albeit under a different name), while the last Ming dynasty pretender was not deposed until 1663. This change of ruling houses was a messy and prolonged affair, and the Qing took almost twenty years to extend their control over the whole of China.
Xia dynasty [change | change source]. The Xia dynasty lasted from 2100 BC until 1600 BC. It was the first ruling dynasty in Chinese history. The Xia was probably created by emperor Yu the Great. It is not known for certain if the Xia dynasty actually existed. Many people thinks that the Xia dynasty is only a legend.