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16-Week Cycle in Markets The ~16-week cycle (≈112 calendar days / ~80 trading days) shows up clearly in many instruments, including SPX. What’s dri...

Published Jul 26, 2026Updated Jul 26, 20262 min read

16-Week Cycle in Markets

The ~16-week cycle (≈112 calendar days / ~80 trading days) shows up clearly in many instruments, including SPX.

What’s driving it?

Many cycle analysts look to the solar system for stable periodicities.

Mercury’s synodic period is 115.9 days — strikingly close.

Is there a real link?

And if so, what’s the mechanism — direct, or indirect via subtle modulation of solar plasma/activity?

More questions than answers at this point.



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