Daily Sunspot Evaluation
Observation Sheet Thursday, 23 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)
- 6
- Number of spots (f)
- 68
- Relative number (R)
- 128
- Observer
- HM
- Reading
- all checks consistent
- File
- 19711223.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | C – 7 | -11 | 20E | 87 | |||
| 2 | A – 4 | -16 | 30E | 77 | |||
| 3 | E – 37 | -14 | 11E | 96 | |||
| 4 | E – 17 | -14 | 04W | 111 | |||
| 5 | J – 1 | -5 | 28W | 135 | |||
| 6 | ? – 2 | 11 | 76W | 183 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.