Daily Sunspot Evaluation
Observation Sheet Sunday, 15 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)
- 9
- Number of spots (f)
- 51
- Relative number (R)
- 141
- Observer
- MH
- Reading
- all checks consistent
- File
- 19571215.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 1 | 19 | 34E | ||||
| 2 | E – 10 | 20 | 70E | ||||
| 3 | E – 13 | -13 | 49E | ||||
| 4 | B – 3 | -22 | 31E | ||||
| 5 | C – 7 | -11 | 9E | ||||
| 6 | J – 1 | -18 | 10E | ||||
| 7 | J – 1 | -21 | 68W | ||||
| 8 | E – 12 | 10 | 60W | ||||
| 9 | B – 3 | 16 | 23W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.