Why did the ancients say "Zuo Dong is in the west"?

In fact, it should be that the ancients knew the direction in the opposite way to us. In modern times, they face north, left, west, right and east, while in ancient times, they face south, Zuo Dong and right and west, which should also be related to better observing the stars.

About astrology, Taoism has scriptures:

The essence of Oriental Dragon Horn. Spit clouds, shout thunder, fly octupole, circle four ghosts, and make me left.

The west should stay from the top. Ying Ying's quality, Su Su's voiceless voice. Intimidate wild animals and stir up mountains. Come and walk to my right.

It can be seen from the left and right directions in ancient times that Zuo Dong was in the right west, Kang Su was in the left and stood on the left; Li Su is on the right, standing on the right.

In ancient times, the north was established according to the astrology, so the east-west direction should also be established according to the astrology, plus the Taoist saying about the stars. In ancient times, positions should be established to better see astrology.

On the other hand, in ancient times, the south was regarded as supreme, and the north was symbolized as failure and submission, so men left and women right came. It can also be seen that the ancients confirmed the direction by facing south.