Definitions for "Maunder minimum"
The period from 1654 to 1714 when it was believed that there were no sunspots. It is now thought that there were some sunspots during that time but less than the numbers counted after 1800.
A period from 1645 to 1715, when the average number of sunspots was unusually low. It was investigated by E. W. Maunder, and corresponds to a time called the "Little Ice Age", when temperatures were unusually cold. ( go to first use in the text)
virtual disappearance of sunspots in the period 1645 to 1715.