Daily Sunspot Evaluation
Observation Sheet Tuesday, 31 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)
- 16
- Number of spots (f)
- 75
- Relative number (R)
- 235
- Observer
- AK
- Reading
- all checks consistent
- File
- 19571231.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | H – 3 | 18 | 0 | ||||
| 2 | C – 8 | 22 | 11E | ||||
| 3 | C – 2 | 21 | 41E | ||||
| 4 | C – 11 | 19 | 47E | ||||
| 5 | A – 2 | -5 | 57E | ||||
| 6 | C – 8 | -18 | 53E | ||||
| 7 | C – 3 | -12 | 8E | ||||
| 8 | A – 3 | -11 | 0 | ||||
| 9 | A – 1 | -25 | 4W | ||||
| 10 | D – 16 | -23 | 16W | ||||
| 11 | H – 2 | -9 | 9W | ||||
| 12 | A – 1 | -22 | 45W | ||||
| 13 | C – 5 | -20 | 60W | ||||
| 14 | J – 1 | -3 | 41W | ||||
| 15 | H – 3 | 13 | 50W | ||||
| 16 | ? – 6 | 24 | 76W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.