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- Solar_cycle_21 abstract "Solar cycle 21 was the 21st solar cycle since 1755, when recording of solar sunspot activity began. The solar cycle lasted 10.3 years, beginning in June 1976 and ending in September 1986. The maximum smoothed sunspot number (monthly number of sunspots averaged over a twelve-month period) observed during the solar cycle was 164.5, and the minimum was 12.3. There were a total of 273 days with no sunspots during this cycle. The largest solar flare of this cycle (X15) occurred on July 11, 1978.".
- Solar_cycle_21 thumbnail Sun920607.jpg?width=300.
- Solar_cycle_21 wikiPageID "28336763".
- Solar_cycle_21 wikiPageRevisionID "589471020".
- Solar_cycle_21 hasPhotoCollection Solar_cycle_21.
- Solar_cycle_21 subject Category:Solar_cycles.
- Solar_cycle_21 comment "Solar cycle 21 was the 21st solar cycle since 1755, when recording of solar sunspot activity began. The solar cycle lasted 10.3 years, beginning in June 1976 and ending in September 1986. The maximum smoothed sunspot number (monthly number of sunspots averaged over a twelve-month period) observed during the solar cycle was 164.5, and the minimum was 12.3. There were a total of 273 days with no sunspots during this cycle. The largest solar flare of this cycle (X15) occurred on July 11, 1978.".
- Solar_cycle_21 label "Solar cycle 21".
- Solar_cycle_21 label "第21太陽周期".
- Solar_cycle_21 label "第21太陽週期".
- Solar_cycle_21 sameAs 第21太陽周期.
- Solar_cycle_21 sameAs m.0cnxb3r.
- Solar_cycle_21 sameAs Q7556138.
- Solar_cycle_21 sameAs Q7556138.
- Solar_cycle_21 wasDerivedFrom Solar_cycle_21?oldid=589471020.
- Solar_cycle_21 depiction Sun920607.jpg.
- Solar_cycle_21 isPrimaryTopicOf Solar_cycle_21.
