The ancients said they were proficient in astronomy, geography, music and history. What is it, geography, music and history?

Astronomy refers to the astronomical calendar. Mainly refers to astrology to determine the geographical position of something, refers to the theory of geomantic omen. Music, temperament, Confucianism regards music as a powerful means of enlightenment and an important part of Zhou Li, so music mainly refers to the so-called "elegant music" in history. This, of course, refers to major events that have happened in the past and in the past.