Daily Sunspot Evaluation
Observation Sheet Friday, 21 September 1956
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)
- 16
- Number of spots (f)
- 61
- Relative number (R)
- 221
- Observer
- ET
- Reading
- all checks consistent
- File
- 19560921.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | C – 4 | 22 | 1E | ||||
| 2 | J – 2 | 23 | 8E | ||||
| 3 | G – 5 | 27 | 22E | ||||
| 4 | G – 6 | 12 | 16E | ||||
| 5 | J – 1 | 22 | 70E | ||||
| 6 | A – 1 | -11 | 25E | ||||
| 7 | H – 3 | -23 | 2W | ||||
| 8 | A – 1 | -30 | 34W | ||||
| 9 | C – 14 | -15 | 27W | ||||
| 10 | ? – 7 | -20 | 66W | ||||
| 11 | A – 2 | -12 | 52W | ||||
| 12 | A – 2 | 12 | 65W | ||||
| 13 | J – 3 | 11 | 59W | ||||
| 14 | ? – 4 | 20 | 73W | ||||
| 15 | J – 1 | 25 | 33W | ||||
| 16 | C – 5 | 31 | 5W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.