Daily Sunspot Evaluation
Observation Sheet Sunday, 12 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)
- 9
- Number of spots (f)
- 64
- Relative number (R)
- 154
- Observer
- HM
- Reading
- all checks consistent
- File
- 19711212.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | C – 36 | 9 | 06E | 243 | |||
| 2 | G – 4 | 19 | 56E | 193 | |||
| 3 | J – 5 | -14 | 61E | 188 | |||
| 4 | J – 3 | -4 | 02W | 251 | |||
| 5 | A – 7 | -14 | 50W | 299 | |||
| 6 | A – 1 | -7 | 36W | 285 | |||
| 7 | ? – 1 | -4 | 74W | 323 | |||
| 8 | A – 1 | 6 | 42W | 291 | |||
| 9 | A – 6 | 10 | 58W | 307 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.