Daily Sunspot Evaluation
Observation Sheet Saturday, 21 June 1952
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)
- 19
- Relative number (R)
- 69
- Observer
- ET
- Reading
- all checks consistent
- File
- 19520621.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | ? – 3 | 0.92 | 65 | |
| 2 | A – 2 | 0.63 | 67 | |
| 3 | J – 1 | 0.39 | 162 | |
| 4 | D – 11 | 0.72 | 236 | |
| 5 | J – 2 | 0.67 | 286 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.