Daily Sunspot Evaluation
Observation Sheet Thursday, 12 December 1957
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)
- 13
- Number of spots (f)
- 47
- Relative number (R)
- 177
- Observer
- FY
- Reading
- all checks consistent
- File
- 19571212.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 2 | 22 | 41E | ||||
| 2 | ? – 1 | -16 | 88E | ||||
| 3 | A – 3 | -14 | 47E | ||||
| 4 | J – 1 | -20 | 49E | ||||
| 5 | A – 1 | -23 | 57E | ||||
| 6 | A – 2 | -26 | 66E | ||||
| 7 | A – 1 | -13 | 6E | ||||
| 8 | A – 2 | -29 | 7E | ||||
| 9 | B – 2 | -17 | 24W | ||||
| 10 | J – 1 | -21 | 32W | ||||
| 11 | J – 1 | -18 | 41W | ||||
| 12 | E – 29 | 10 | 21W | ||||
| 13 | A – 1 | 31 | 48W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.