Daily Sunspot Evaluation
Observation Sheet Saturday, 28 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)
- 7
- Number of spots (f)
- 30
- Relative number (R)
- 100
- Observer
- WG
- Reading
- all checks consistent
- File
- 19510728.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | A – 3 | 0.34 | 127 | |
| 2 | A – 1 | 0.22 | 149 | |
| 3 | C – 8 | 0.22 | 217 | |
| 4 | B – 11 | 0.76 | 254 | |
| 5 | A – 2 | 0.42 | 257 | |
| 6 | J – 1 | 0.88 | 271 | |
| 7 | B – 4 | 0.65 | 274 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.