Our spotless sun

The Deniers: Our spotless sun - FP Comment

We are now at the beginning of Solar Cycle 24, so named because it is the 24th consecutive cycle that astronomers have listed, starting with the first cycle that began in March, 1755, and ended in June, 1766. Each cycle lasts an average of approximately 11 years; each is marked by sunspots that first erupt in the mid latitudes of the sun, and then, over the course of the 11 years, erupt progressively toward the sun’s equator; each is marked by a change in the polarity of the sun’s hemispheres; each changes the temperature on Earth in ways that humans don’t fully understand, but cannot in all honesty deny.