Daily Sunspot Evaluation
Observation Sheet Tuesday, 17 December 1968
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)
- 57
- Relative number (R)
- 117
- Observer
- SM
- Reading
- all checks consistent
- File
- 19681217.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 5 | 18 | 0 | 238 | |||
| 2 | B – 4 | 12 | 12E | 226 | |||
| 3 | A – 1 | -20 | 29E | 209 | |||
| 4 | C – 26 | -22 | 09E | 229 | |||
| 5 | G – 9 | -32 | 50W | 288 | |||
| 6 | D – 12 | 22 | 62W | 300 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.