南北朝时,我国出了一位杰出的科学家祖冲之。祖冲之的祖父名叫祖昌,是管理朝廷建筑的长官。他经常随爷爷到工地上,处处感到新鲜,问这问那。有一次,祖冲之问爷爷:“为什么每月十五的月亮一定会圆呢?”爷爷解释说:“月亮运行有它自己的规律,所以有缺有圆啊。”祖冲之越听越有趣,从此,经常缠住爷爷问个不停。爷爷便对他说:“孩子,看来你对四书五经不感兴趣,对天文却是用心钻研,正好,咱们家里的天文历书多得很,我找几本你先看一看,不懂的地方问我。”这样,祖冲之对天文历法的兴趣越来越 Northern and Southern Dynasties, our country was an outstanding scientist Zu Chongzhi. Zu Chong’s grandfather named Zu Chang, is the governor of the administration of the court building. He often with grandfather to the site, always feel fresh, ask this question. Once upon a time, Zu Chong asked the grandfather: “Why the moon of fifteen every month will be round? ” Grandpa explained: “Moon runs with its own laws, so there is a lack of a circle ah. ” Interesting, from time to time, often wrapped around my grandfather asked non-stop. Grandfather said to him: “Children, it seems that you are not interested in the Four Books and Five Classics, but astronomy is carefully studied, just, our astronomical almanac in the family is very much, I find a few of you first take a look, do not understand The place asked me. ”Thus, Zu Chong’s growing interest in the astronomical calendar