What turns in cycles, guides the tides, and has been observed since ancient times but is not a living thing?

Category: Knowledge · Difficulty: expert

Hint: It's responsible for lunar phases and gravitational effects on water.

Answer

The Moon

Explanation

The Moon's gravitational pull influences the tides and its phases have been tracked by civilizations throughout history.

This is a expert knowledge riddle — one of the harder riddles here. The answer is The Moon.

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