地球形成已经有40多亿年,人类出现后便开始认识脚下这片土地.5000年前,我国古代先民就已经开始了对天地万物的观察与探索,经过了叩问、求知、研究、发明的漫长历程,中国古代天文学形成了独特的知识体系,许多震烁古今的奇迹都发生在中原这片文明厚土上.汉代张衡发明的地动仪是其中最为杰出的代表. The Earth has been formed for more than 4 billion years. Since the advent of mankind, people have begun to understand the land beneath their feet. Before 5,000 years ago, ancient Chinese ancestors had begun to observe and explore all things in the world, and they have been asked, learned, studied and invented. For a long period of time, ancient Chinese astronomy formed a unique knowledge system. Many miracles that shook ancient and modern times occurred in the thick soil of the Central Plains. The seismograph invented by Zhang Heng in the Han Dynasty was one of the most outstanding representatives.