Daily Sunspot Evaluation
Observation Sheet Thursday, 25 April 1957
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)
- 13
- Number of spots (f)
- 77
- Relative number (R)
- 207
- Observer
- WG
- Reading
- all checks consistent
- File
- 19570425.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 1 | 16 | 70E | ||||
| 2 | D – 6 | -3 | 66E | ||||
| 3 | J – 1 | -10 | 34E | ||||
| 4 | J – 1 | -11 | 67E | ||||
| 5 | D – 20 | -18 | 38E | ||||
| 6 | A – 1 | -19 | 58E | ||||
| 7 | C – 7 | -25 | 8E | ||||
| 8 | C – 11 | -15 | 13W | ||||
| 9 | J – 2 | -16 | 38W | ||||
| 10 | ? – 1 | -18 | 75W | ||||
| 11 | J – 2 | -14 | 60W | ||||
| 12 | D – 18 | -11 | 35W | ||||
| 13 | C – 6 | 29 | 30W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.