Daily Sunspot Evaluation
Observation Sheet Thursday, 17 January 1952
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)
- 25
- Relative number (R)
- 65
- Observer
- WG
- Reading
- all checks consistent
- File
- 19520117.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | C – 13 | 0.45 | 70 | |
| 2 | A – 1 | 0.96 | 274 | |
| 3 | H – 7 | 0.5 | 283 | |
| 4 | C – 4 | 0.72 | 285 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.