Daily Sunspot Evaluation
Observation Sheet Thursday, 12 July 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)
- 61
- Relative number (R)
- 101
- Observer
- WG
- Reading
- all checks consistent
- File
- 19510712.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | C – 3 | 0.17 | 61 | |
| 2 | E – 54 | 0.54 | 117 | |
| 3 | A – 3 | 0.46 | 274 | |
| 4 | C – 1 | 0.68 | 287 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.