Solar cycle 2

Solar cycle 2 was the second solar cycle since 1755, when extensive recording of sunspot activity began.^[1][2] The solar cycle lasted 9 years, beginning in June 1766 and ending in June 1775. The maximum smoothed sunspot number observed during the solar cycle was 193.0 (September 1769), and the starting minimum was 18.6.^[3]

Solar cycle 2
Drawing of a sunspot from 1774, illustrating the Wilson effect
Sunspot data
Start date	June 1766
End date	June 1775
Duration (years)	9
Max count	193.0
Max count month	September 1769
Min count	18.6
Cycle chronology
Previous cycle	Solar cycle 1 (1755–1766)
Next cycle	Solar cycle 3 (1775–1784)

Sunspot observations by Alexander Wilson during this period established the Wilson effect.

See also

• List of solar cycles