Daily Sunspot Evaluation
Observation Sheet Tuesday, 20 December 1955
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)
- 9
- Number of spots (f)
- 40
- Relative number (R)
- 130
- Observer
- MH
- Reading
- all checks consistent
- File
- 19551220.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | A – 1 | 0.89 | 64 | |
| 2 | A – 1 | 0.94 | 75 | |
| 3 | D – 10 | 0.75 | 120 | |
| 4 | J – 1 | 0.69 | 126 | |
| 5 | A – 3 | 0.7 | 131 | |
| 6 | J – 3 | 0.55 | 209 | |
| 7 | A – 4 | 0.71 | 251 | |
| 8 | D – 10 | 0.85 | 307 | |
| 9 | C – 7 | 0.71 | 316 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.