Solar cycle 2
Solar cycle 2 was the second solar cycle since 1755, when extensive recording of sunspot activity began. 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.
| 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.
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