Daily Sunspot Evaluation
Observation Sheet Sunday, 21 May 1961
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)
- 6
- Number of spots (f)
- 26
- Relative number (R)
- 86
- Observer
- SK
- Reading
- all checks consistent
- File
- 19610521.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 8 | 15 | 30E | ||||
| 2 | B – 6 | 17 | 58E | ||||
| 3 | J – 1 | 3 | 72E | ||||
| 4 | A – 2 | -12 | 23W | ||||
| 5 | D – 8 | 3 | 48W | ||||
| 6 | J – 1 | 9 | 23W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.