Daily Sunspot Evaluation
Observation Sheet Wednesday, 21 August 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)
- 8
- Number of spots (f)
- 56
- Relative number (R)
- 136
- Observer
- FY
- Reading
- all checks consistent
- File
- 19570821.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | E – 39 | 17 | 10E | ||||
| 2 | A – 1 | 11 | 7E | ||||
| 3 | ? – 1 | 14 | 81E | ||||
| 4 | B – 4 | 12 | 39E | ||||
| 5 | J – 1 | -14 | 58E | ||||
| 6 | D – 7 | -21 | 29W | ||||
| 7 | J – 2 | -23 | 48W | ||||
| 8 | J – 1 | 22 | 47W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.