[Virginia-American]

. There is no chance that the properties of a basic chemical process could have been influenced by the rotation of the earth

Why's that? There are lots of reactions that absorb/emit light.

[UnbelievingScumOnTheOtherSide]

There are lots of reactions that absorb/emit light.

The circadian rhythm and this 6-hour cycle are the opposite of absorbing and emitting light. They are chemical reactions that occur in the absence of a sunlight cycle. If the daily sunlight cycle keeps time and cues the body when to wake and sleep, what evolutionary need was there for the body to develop an independent and redundant timer and how could it have happened upon this rather complex one that has nothing to do with light in response to light?