Daily Sunspot Evaluation
Observation Sheet Thursday, 12 December 1974
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)
- 2
- Number of spots (f)
- 26
- Relative number (R)
- 46
- Observer
- ED
- Reading
- all checks consistent
- File
- 19741212.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | D – 25 | 10 | 12E | 174 | |||
| 2 | ? – 1 | 13 | 82E | 104 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.