Daily Sunspot Evaluation
Observation Sheet Tuesday, 20 December 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)
- 5
- Number of spots (f)
- 6
- Relative number (R)
- 56
- Observer
- SK
- Reading
- all checks consistent
- File
- 19661220.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 1 | 29 | 62E | 65 | |||
| 2 | A – 1 | 15 | 60W | 187 | |||
| 3 | ? – 1 | 21 | 76W | 203 | |||
| 4 | ? – 2 | 24 | 70W | 197 | |||
| 5 | A – 1 | 17 | 45W | 172 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.