| Cycle Num: | 2 |
| Start Date: | June 1766 |
| End Date: | June 1775 |
| Duration: | 9 |
| Max Count: | 193.0 |
| Max Count Date: | September 1769 |
| Min Count: | 18.6 |
| Prev Name: | Solar cycle 1 |
| Prev Dates: | 1755–1766 |
| Next Name: | Solar cycle 3 |
| Next Dates: | 1775–1784 |
Solar cycle 2 was the second solar cycle since 1755, when extensive recording of sunspot activity began.[1] 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.[2]
Sunspot observations by Alexander Wilson during this period established the Wilson effect.