Daily Sunspot Evaluation
Observation Sheet Saturday, 21 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)
- 14
- Number of spots (f)
- 136
- Relative number (R)
- 276
- Observer
- MH
- Reading
- all checks consistent
- File
- 19570921.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 1 | 24 | 80E | ||||
| 2 | ? – 1 | 20 | 80E | ||||
| 3 | ? – 9 | 15 | 76E | ||||
| 4 | B – 3 | -10 | 33E | ||||
| 5 | B – 3 | -17 | 44E | ||||
| 6 | C – 13 | -22 | 16W | ||||
| 7 | A – 2 | -23 | 23W | ||||
| 8 | ? – 1 | -15 | 80W | ||||
| 9 | E – 22 | 9 | 21W | ||||
| 10 | C – 10 | 13 | 46W | ||||
| 11 | J – 1 | 15 | 57W | ||||
| 12 | B – 7 | 11 | 9W | ||||
| 13 | F – 43 | 22 | 26W | ||||
| 14 | E – 20 | 11 | 1W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.