Daily Sunspot Evaluation
Observation Sheet Friday, 20 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)
- 5
- Number of spots (f)
- 40
- Relative number (R)
- 90
- Observer
- AT
- Reading
- all checks consistent
- File
- 19681220.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 2 | -6 | 52E | 147 | |||
| 2 | D – 18 | -20 | 10W | 209 | |||
| 3 | C – 7 | -23 | 31W | 230 | |||
| 4 | C – 10 | -12 | 25W | 224 | |||
| 5 | B – 3 | 30 | 20W | 219 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.