Daily Sunspot Evaluation
Observation Sheet Friday, 7 December 1951
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)
- 4
- Number of spots (f)
- 19
- Relative number (R)
- 59
- Observer
- ET
- Reading
- all checks consistent
- File
- 19511207.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | A – 3 | 0.83 | 108 | |
| 2 | B – 2 | 0.36 | 246 | |
| 3 | D – 10 | 0.57 | 263 | |
| 4 | B – 4 | 0.5 | 267 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.