Daily Sunspot Evaluation
Observation Sheet Wednesday, 21 September 1966
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)
- 4
- Number of spots (f)
- 47
- Relative number (R)
- 87
- Observer
- SK
- Reading
- all checks consistent
- File
- 19660921.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | E – 21 | 21 | 01E | 231 | |||
| 2 | ? – 8 | 23 | 76E | 156 | |||
| 3 | H – 11 | 5 | 25W | 257 | |||
| 4 | C – 7 | 18 | 63W | 295 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.