Daily Sunspot Evaluation
Observation Sheet Saturday, 17 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)
- 5
- Number of spots (f)
- 54
- Relative number (R)
- 104
- Observer
- WG
- Reading
- all checks consistent
- File
- 19551217.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | H – 7 | 0.42 | 12 | |
| 2 | B – 10 | 0.51 | 37 | |
| 3 | ? – 1 | 0.98 | 120 | |
| 4 | H – 10 | 0.61 | 155 | |
| 5 | E – 26 | 0.43 | 342 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.