Daily Sunspot Evaluation
Observation Sheet Sunday, 25 July 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)
- 11
- Number of spots (f)
- 63
- Relative number (R)
- 173
- Observer
- SK
- Reading
- all checks consistent
- File
- 19710725.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 1 | 17 | 73E | 224 | |||
| 2 | J – 1 | -7 | 55E | 242 | |||
| 3 | H – 5 | -14 | 66E | 231 | |||
| 4 | B – 2 | -15 | 41E | 256 | |||
| 5 | J – 2 | -14 | 43W | 340 | |||
| 6 | B – 3 | -18 | 60W | 357 | |||
| 7 | A – 1 | 9 | 78W | 15 | |||
| 8 | E – 21 | 13 | 56W | 353 | |||
| 9 | A – 2 | 15 | 43W | 340 | |||
| 10 | D – 19 | 11 | 11W | 308 | |||
| 11 | J – 6 | 21 | 02W | 299 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.