Daily Sunspot Evaluation
Observation Sheet Tuesday, 20 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)
- 63
- Relative number (R)
- 143
- Observer
- YÖ
- Reading
- all checks consistent
- File
- 19570820.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | F – 31 | 17 | 20E | ||||
| 2 | A – 1 | 10 | 18E | ||||
| 3 | B – 3 | 12 | 52E | ||||
| 4 | J – 1 | -14 | 68E | ||||
| 5 | D – 11 | -22 | 18W | ||||
| 6 | C – 8 | -21 | 33W | ||||
| 7 | A – 4 | 21 | 69W | ||||
| 8 | C – 4 | 20 | 38W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.