So, history had invented this basic unit of time based on a fraction of a day, and then scientists came along with all this new, precise mathematical astronomy, and realized that definition stunk.

所以，历史发明了这个基本的时间单位，基于一天的一小部分，然后科学家们带来了全新的，精确的数学天文学，并意识到这个定义很糟糕。