Daily Sunspot Evaluation
Observation Sheet Tuesday, 13 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)
- 7
- Number of spots (f)
- 87
- Relative number (R)
- 157
- Observer
- SK
- Reading
- all checks consistent
- File
- 19661213.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | E – 15 | 21 | 03E | 216 | |||
| 2 | H – 4 | 18 | 50E | 169 | |||
| 3 | ? – 2 | 22 | 68E | 151 | |||
| 4 | F – 47 | -22 | 28W | 247 | |||
| 5 | H – 1 | 8 | 40W | 259 | |||
| 6 | C – 7 | 27 | 30W | 249 | |||
| 7 | B – 11 | 29 | 23W | 242 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.