Daily Sunspot Evaluation
Observation Sheet Sunday, 20 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)
- 9
- Number of spots (f)
- 126
- Relative number (R)
- 216
- Observer
- MH
- Reading
- all checks consistent
- File
- 19510520.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | E – 26 | 0.52 | 20 | |
| 2 | A – 3 | 0.58 | 38 | |
| 3 | A – 2 | 0.79 | 42 | |
| 4 | J – 1 | 0.81 | 76 | |
| 5 | D – 23 | 0.48 | 97 | |
| 6 | J – 3 | 0.32 | 112 | |
| 7 | A – 5 | 0.8 | 257 | |
| 8 | F – 60 | 0.85 | 266 | |
| 9 | C – 3 | 0.44 | 281 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.