Daily Sunspot Evaluation
Observation Sheet Tuesday, 7 December 1971
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)
- 42
- Relative number (R)
- 112
- Observer
- SK
- Reading
- all checks consistent
- File
- 19711207.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | D – 8 | 10 | 06E | 311 | |||
| 2 | B – 2 | 10 | 77E | 240 | |||
| 3 | J – 1 | -3 | 67E | 250 | |||
| 4 | J – 3 | -13 | 16E | 301 | |||
| 5 | E – 16 | -5 | 04W | 321 | |||
| 6 | ? – 1 | -13 | 80W | 37 | |||
| 7 | B – 11 | 8 | 32W | 349 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.