Four

To be fair to our ancestors, there’s quite some serious science in the four disciplines other than medicine.

The most obvious one is the relation between physiognomy and psychology.

The better developed but less well known one, however, is astrology.

You know what, there were the so-called seven major and four minor stars (七政四餘) in the Chinese astrology.

The seven major ones are, of course, the sun, the moon, the Venus (金), the Jupiter (木), the Mercury (水), the Mars (火), and the Saturn (土).

The amazing part, however, comes with the four minor stars.

In Chinese, they are: 氣、孛、羅、計.

Translating into modern scientific English, they could be represented as the asteroid belt (小行星帶) (alas, “氣” means gas !), the Uranus, the Neptune, and some residual small ones.

(計: by calculation and estimation.)

PS. One of the most famous experts in Chinese astrology was Yelü Chucai (耶律楚材), at one time the political advisor of the early Mongol Empire.

His son was the factitious character in The Return of the Condor Heroes (神鵰俠侶) under Jin Yong (金庸): Yelu Qi (耶律齊).