Daily Sunspot Evaluation
Observation Sheet Tuesday, 28 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)
- 22
- Relative number (R)
- 92
- Observer
- HM
- Reading
- all checks consistent
- File
- 19711228.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | 22 | 71E | 330 | |||
| 2 | J – 1 | -4 | 73E | 328 | |||
| 3 | A – 1 | -7 | 43E | 358 | |||
| 4 | C – 11 | -14 | 04W | 45 | |||
| 5 | G – 5 | -15 | 57W | 98 | |||
| 6 | H – 1 | -14 | 74W | 115 | |||
| 7 | B – 2 | -11 | 50W | 91 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.