Daily Sunspot Evaluation
Observation Sheet Thursday, 15 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)
- 9
- Number of spots (f)
- 61
- Relative number (R)
- 151
- Observer
- ET
- Reading
- all checks consistent
- File
- 19601215.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | C – 14 | -4 | 6W | ||||
| 2 | C – 9 | -13 | 28W | ||||
| 3 | A – 1 | -10 | 37W | ||||
| 4 | B – 5 | 14 | 22W | ||||
| 5 | A – 1 | 8 | 15W | ||||
| 6 | A – 2 | 27 | 57W | ||||
| 7 | C – 6 | 24 | 33W | ||||
| 8 | C – 9 | 14 | 20W | ||||
| 9 | C – 14 | 17 | 9W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.