天文学
黑子极小期
That was followed by the Dalton Minimum from 1790 to 1830, another period of well below normal sunspot activity.
FORBES: To The Horror Of Global Warming Alarmists, Global Cooling Is Here
That was followed by a period of even lower sunspot activity that lasted 90 years from 1460 to 1550 known as the Sporer Minimum.
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