Daily Sunspot Evaluation
Observation Sheet Monday, 21 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)
- 111
- Relative number (R)
- 201
- Observer
- WG
- Reading
- all checks consistent
- File
- 19510521.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | E – 29 | 0.43 | 8 | |
| 2 | C – 11 | 0.46 | 30 | |
| 3 | A – 1 | 0.69 | 38 | |
| 4 | J – 2 | 0.71 | 78 | |
| 5 | ? – 1 | 0.99 | 92 | |
| 6 | D – 33 | 0.36 | 110 | |
| 7 | J – 6 | 0.24 | 140 | |
| 8 | F – 26 | 0.94 | 264 | |
| 9 | A – 2 | 0.61 | 272 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.