Daily Sunspot Evaluation
Observation Sheet Wednesday, 20 June 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)
- 5
- Number of spots (f)
- 104
- Relative number (R)
- 154
- Observer
- WG
- Reading
- all checks consistent
- File
- 19510620.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | H – 4 | 0.58 | 57 | |
| 2 | J – 1 | 0.84 | 108 | |
| 3 | F – 85 | 0.42 | 232 | |
| 4 | A – 2 | 0.53 | 305 | |
| 5 | C – 12 | 0.35 | 308 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.