Solar cycle 3

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Solar cycle 3
Sunspot data
Start date June 1775
End date September 1784
Duration (years) 9.3
Max count 264.3
Max count month May 1778
Min count 12.0
Cycle chronology
Previous cycle Solar cycle 2 (1766-1775)
Next cycle Solar cycle 4 (1784-1798)
William Herschel began observing sunspots during this period.

Solar cycle 3 was the third solar cycle since 1755, when extensive recording of solar sunspot activity began.[1][2] The solar cycle lasted 9.3 years, beginning in June 1775 and ending in September 1784. The maximum smoothed sunspot number (SIDC formula) observed during the solar cycle was 264.3 (May 1778), and the starting minimum was 12.0.[3]

William Herschel began observing sunspots during this period.[4]

See also[edit]


  1. ^ Kane, R.P. (2002). "Some Implications Using the Group Sunspot Number Reconstruction". Solar Physics 205(2), 383-401.
  2. ^ "The Sun: Did You Say the Sun Has Donuts?". Space Today Online. Retrieved 12 August 2010. 
  3. ^ SIDC Monthly Smoothed Sunspot Number. "[1]"
  4. ^ Vaquero, J.M.; Vázquez, M. (2009). The Sun Recorded Through History. Springer. p. 79. ISBN 0387927905.