Daily Sunspot Evaluation
Observation Sheet Sunday, 18 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)
- 18
- Relative number (R)
- 68
- Observer
- BG
- Reading
- all checks consistent
- File
- 19601218.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | C – 8 | 12 | 26E | ||||
| 2 | B – 4 | -14 | 12W | ||||
| 3 | ? – 1 | -12 | 70W | ||||
| 4 | C – 3 | -4 | 46W | ||||
| 5 | B – 2 | 17 | 53W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.