Daily Sunspot Evaluation
Observation Sheet Saturday, 17 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)
- 6
- Number of spots (f)
- 38
- Relative number (R)
- 98
- Observer
- SB
- Reading
- counts consistent, some coordinates doubtful
- File
- 19661217.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 2 | 12 | 15E | 142 ⚠ | |||
| 2 | ? – 1 | -23 | 77W | 242 | |||
| 3 | C – 8 | 14 | 39W | 204 | |||
| 4 | D – 9 | 22 | 51W | 216 | |||
| 5 | E – 9 | 16 | 22W | 187 | |||
| 6 | C – 9 | 17 | 4W | 169 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.