Daily Sunspot Evaluation
Observation Sheet Sunday, 25 April 1971
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)
- 4
- Number of spots (f)
- 26
- Relative number (R)
- 66
- Observer
- SK
- Reading
- all checks consistent
- File
- 19710425.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 2 | 8 | 35E | 28 | |||
| 2 | ? – 1 | -4 | 78E | 345 | |||
| 3 | D – 11 | -12 | 30E | 33 | |||
| 4 | C – 12 | -11 | 19E | 44 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.