Daily Sunspot Evaluation
Observation Sheet Saturday, 21 May 1955
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)
- 3
- Number of spots (f)
- 37
- Relative number (R)
- 67
- Observer
- ET
- Reading
- all checks consistent
- File
- 19550521.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | C – 6 | 0.78 | 36 | |
| 2 | A – 2 | 0.94 | 98 | |
| 3 | E – 29 | 0.46 | 345 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.