Daily Sunspot Evaluation
Observation Sheet Saturday, 17 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)
- 5
- Number of spots (f)
- 29
- Relative number (R)
- 79
- Observer
- AB
- Reading
- all checks consistent
- File
- 19601217.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | D – 6 | 12 | 38E | ||||
| 2 | A – 4 | -14 | 1W | ||||
| 3 | H – 4 | -12 | 57W | ||||
| 4 | G – 7 | -4 | 35W | ||||
| 5 | B – 8 | 18 | 39W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.