Daily Sunspot Evaluation
Observation Sheet Wednesday, 20 December 1967
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)
- 33
- Relative number (R)
- 83
- Observer
- SB
- Reading
- all checks consistent
- File
- 19671220.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 2 | 23 | 09E | 340 | |||
| 2 | G – 3 | 23 | 14E | 335 | |||
| 3 | H – 2 | -25 | 36E | 313 | |||
| 4 | F – 24 | 18 | 40W | 29 | |||
| 5 | A – 2 | 21 | 54W | 45 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.