[Diana in Wisconsin]

[Diana in Wisconsin]

“Galileo made a series of sunspot drawing in the summer of 1612,” according to an introductory class to astronomy uploaded by Kendall. “The 36 drawings illustrate the motion of sunspots across the disk—which is actually a sequence showing the rotation of the sun.”

[MrEdd]

All of this was taught in school when I was a student.

[IndispensableDestiny]

Solar cycle 24 is now approaching minimum in April 2020. The Space Weather Prediction Center is not projecting an extended minimum. The next maximum is expected in July 2025. Go to their website and see.

https://www.swpc.noaa.gov/news/solar-cycle-25-forecast-update

[tired&retired]

If you understand this, go the next step to understand the sun’s 11 year polarity reversal that causes the solar max/min.

The look at the earth’s longer cycle of similar polarity reversals.

There is a much greater influence from external to these two bodies.

After all, our solar system is in a dynamic spiral galaxy.

[zeugma]

I’d like to point out that we have pretty good records of sunspot activity going back a thousand years thanks to the Chinese. It may even go back further than that, but I’d have to look it up again, and I am lazy.

[Hot Tabasco]

Is that colby or cheddar?