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The 10 longest continuous observation series
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There was at least one sunspot drawing each day.
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| Length | Begin | End |
| 51 | 1963-12-26 | 1964-02-14 |
| 53 | 1992-07-13 | 1992-09-03 |
| 55 | 1956-08-02 | 1956-09-25 |
| 58 | 2006-06-04 | 2006-07-31 |
| 58 | 2019-05-31 | 2019-07-27 |
| 60 | 2008-07-15 | 2008-09-12 |
| 61 | 2022-06-08 | 2022-08-07 |
| 64 | 1971-06-28 | 1971-08-30 |
| 72 | 2017-06-08 | 2017-08-18 |
| 91 | 2026-06-11 | 2026-09-09 |
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