Daily Sunspot Evaluation
Observation Sheet Saturday, 25 September 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)
- 3
- Number of spots (f)
- 20
- Relative number (R)
- 50
- Observer
- SM
- Reading
- all checks consistent
- File
- 19710925.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 5 | 13 | 06E | 193 | |||
| 2 | H – 2 | -7 | 68E | 131 | |||
| 3 | C – 13 | -14 | 09E | 190 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.