Daily Sunspot Evaluation
Observation Sheet Wednesday, 21 December 1960
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)
- 4
- Number of spots (f)
- 46
- Relative number (R)
- 86
- Observer
- AB
- Reading
- all checks consistent
- File
- 19601221.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 2 | 14 | 77E | ||||
| 2 | D – 19 | -21 | 10W | ||||
| 3 | B – 7 | -15 | 53W | ||||
| 4 | C – 18 | 11 | 13W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.