Daily Sunspot Evaluation
Observation Sheet Wednesday, 13 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)
- 12
- Number of spots (f)
- 39
- Relative number (R)
- 159
- Observer
- SB
- Reading
- all checks consistent
- File
- 19671213.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | S – 2 | 20 | 47E | 35 | |||
| 2 | A – 1 | 20 | 58E | 24 | |||
| 3 | J – 2 | 10 | 43E | 39 | |||
| 4 | H – 7 | -19 | 10W | 92 | |||
| 5 | A – 1 | -23 | 17W | 97 | |||
| 6 | G – 14 | -25 | 30W | 112 | |||
| 7 | J – 1 | -15 | 18W | 100 | |||
| 8 | J – 1 | -16 | 42W | 124 | |||
| 9 | J – 1 | 9 | 81W | 163 | |||
| 10 | J – 4 | 14 | 67W | 149 | |||
| 11 | J – 2 | 25 | 50W | 132 | |||
| 12 | H – 3 | 9 | 05W | 87 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.