I mark the passage of time but move relative to the stars. What am I?
Category: Science · Difficulty: hard
Hint: Consider how we measure time based on celestial positions.
Answer
Celestial Cycle
Explanation
A sidereal day is the time it takes for the Earth to rotate once relative to the stars, approximately 23 hours and 56 minutes.
This is a hard science riddle — a tricky one that takes a little thought. The answer is Celestial Cycle.
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