Table 2.
Sunspot group observations available for the period 1729–1731.
| Observer | Date | Groups | Type |
|---|---|---|---|
| Weidler | 1729-2-1 | 1 | O |
| Weidler | 1729-3-18 | 1 | O |
| Kraft | 1729-5-3 | 1 | O |
| Kraft | 1729-5-4 | 1 | O |
| Kraft | 1729-5-5 | 1 | O |
| Kraft | 1729-5-6 | 1 | O |
| Kraft | 1729-5-7 | 1 | O |
| Kraft | 1729-5-8 | 1 | O |
| Kraft | 1729-5-9 | 1 | O |
| Kraft | 1729-5-10 | 1 | O |
| Kraft | 1729-5-22 | 1 | O |
| Kraft | 1729-7-20 | 0 | O |
| Kraft | 1729-7-21 | 0 | O |
| Kraft | 1729-7-22 | 0 | O |
| Kraft | 1729-7-23 | 0 | O |
| Kraft | 1729-7-24 | 1 | O |
| Beyer | 1729-7-31 | 1 | O |
| Beyer | 1729-12-14 | 4 | N |
| Beyer | 1730-1-17 | 2 | O |
| Beyer | 1730-1-27 | 3 | O |
| Beyer | 1730-3-1 | 11 | C |
| Beyer | 1730-3-2 | 12 | C |
| Beyer | 1730-3-7 | 6 | C |
| Beyer | 1730-3-12 | 4 | C |
| Beyer | 1730-4-4 | 9 | C |
| Beyer | 1730-4-5 | 12 | C |
| Beyer | 1730-4-6 | 9 | O |
| Beyer | 1730-4-11 | 6 | C |
| Beyer | 1730-4-14 | 5 | O |
| Beyer | 1730-4-29 | 9 | C |
| Beyer | 1730-4-30 | 8 | C |
| Beyer | 1730-5-2 | 7 | C |
| Beyer | 1730-5-3 | 9 | C |
| Beyer | 1730-7-2 | 1 | O |
| Hell | 1730-7-15 | 3 | C |
| Wasse | 1730-9-23 | 1 | O |
| Wasse | 1730-9-25 | 0 | O |
| Hell | 1731-12-29 | – | C |
Notes. The three first columns show the observer, date, and number of sunspot groups registered. The last column indicates if a sunspot record was previously available (O), if a sunspot observation was not published previously (N), or if a value was corrected with respect to group numbers of previously available records (C). In total, 37 observations are available during this time span in addition to Hell’s record.
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