Daily Sunspot Evaluation
Observation Sheet Thursday, 19 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)
- 7
- Number of spots (f)
- 44
- Relative number (R)
- 114
- Observer
- SM
- Reading
- all checks consistent
- File
- 19681219.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | -6 | 64E | 148 | |||
| 2 | A – 1 | -5 | 22E | 190 | |||
| 3 | C – 13 | -20 | 01E | 211 | |||
| 4 | B – 15 | -23 | 18W | 230 | |||
| 5 | B – 6 | -12 | 12W | 224 | |||
| 6 | J – 1 | -32 | 85W | 297 | |||
| 7 | B – 7 | 30 | 06W | 218 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.