Daily Sunspot Evaluation
Observation Sheet Wednesday, 16 May 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)
- 153
- Relative number (R)
- 223
- Observer
- WG
- Reading
- all checks consistent
- File
- 19510516.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | D – 7 | 0.2 | 4 | |
| 2 | B – 7 | 0.15 | 30 | |
| 3 | C – 12 | 0.55 | 45 | |
| 4 | J – 2 | 0.94 | 85 | |
| 5 | J – 1 | 0.62 | 263 | |
| 6 | A – 3 | 0.38 | 274 | |
| 7 | F – 121 | 0.27 | 325 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.