57
A Year of Sunspots
(apod.nasa.gov)
Is that variation by month due to a specific reason? How it bands together at certain latitudes?
Its part of the 11 year solar cycle. The bands move from the poles to the equator in during the cycle.
Edit: If your really interested: https://www.youtube.com/watch?v=fpNBIqjt_-4

Well damn, that's really interesting.
Sunspot? I'll go blind!
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