Daily Sunspot Evaluation
Observation Sheet Friday, 20 September 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)
- 11
- Number of spots (f)
- 132
- Relative number (R)
- 242
- Observer
- FY
- Reading
- all checks consistent
- File
- 19570920.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 6 | 10 | 15E | ||||
| 2 | B – 5 | -18 | 55E | ||||
| 3 | D – 15 | -22 | 2W | ||||
| 4 | A – 1 | -23 | 34W | ||||
| 5 | C – 2 | -23 | 69W | ||||
| 6 | J – 2 | -15 | 63W | ||||
| 7 | C – 26 | 12 | 33W | ||||
| 8 | J – 1 | 15 | 42W | ||||
| 9 | A – 1 | 24 | 72W | ||||
| 10 | F – 49 | 23 | 12W | ||||
| 11 | E – 24 | 9 | 1W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.