Spotless Days

Spotless Days
A spotless day is a day without sunspots, a day when the face of the sun is utterly blank. Spotless days never occur during Solar Max when the sun is active, but they are common during solar minimum, the opposite phase of the 11-year sunspot cycle when the sun is very quiet. By counting spotless days, we can keep track of the depth and longevity of a solar minimum.

By the standard of spotless days, the ongoing solar minimum is the deepest in a century: NASA report. In 2008, no sunspots were observed on 266 of the year's 366 days (73%). To find a year with more blank suns, you have to go all the way back to 1913, which had 311 spotless days (85%):




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