Daily Sunspot Evaluation
Observation Sheet Thursday, 20 September 1956
There is no typed record for this day. The values below were read by computer from the table on the sheet; when in doubt, see the drawing. Details →
- Number of groups (g)
- 16
- Number of spots (f)
- 69
- Relative number (R)
- 229
- Observer
- AG
- Reading
- all checks consistent
- File
- 19560920.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | C – 7 | 32 | 4 | |
| 2 | G – 11 | 23 | 13 | |
| 3 | G – 7 | 29 | 31 | |
| 4 | C – 8 | 13 | 26 | |
| 5 | J – 1 | 23 | 78 | |
| 6 | B – 2 | -15 | 37 | |
| 7 | H – 4 | -23 | 8 | |
| 8 | A – 1 | -29 | 25 | |
| 9 | C – 7 | -15 | 19 | |
| 10 | B – 3 | -13 | 41 | |
| 11 | ? – 7 | -19 | 58 | |
| 12 | C – 5 | 12 | 52 | |
| 13 | A – 3 | 21 | 65 | |
| 14 | A – 1 | 25 | 47 | |
| 15 | J – 1 | 25 | 23 | |
| 16 | A – 1 | 26 | 15 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.