Cold knowledge（4/100）/Increase chat topics/Seeing time through the eyes of a cat

Ancient Japanese ninja can tell time by the pupil of a cat

This is because the cat's pupils change size with the intensity of light, and this setting is to protect the retina from bright light and also to see more clearly in the dark.

In the ancient Chinese book "I Ching Cunxin", it is written
The cat's eyes in the black eyes, a day with the twelve hours of change, the song says: "Son line Ruoxi Mao You round, Yin Shen has Hai such as the date nucleus, Cunxu Ugwei almond full."

The ancient Japanese saying is 六つ丸く 五七卵に 四つ八つは 柿の核なり 九つは針。
To wit: the cat's pupil is round at six in the morning, egg-shaped at eight in the morning and four in the afternoon, like a persimmon kernel at ten in the morning and two in the afternoon, and as thin as a needle at noon.

These examples can be seen as a very common cat's eye watch in ancient times.

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