Daily Sunspot Evaluation
Observation Sheet Monday, 9 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)
- 10
- Number of spots (f)
- 51
- Relative number (R)
- 151
- Observer
- FY
- Reading
- all checks consistent
- File
- 19571209.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 10 | 18 | 6E | ||||
| 2 | H – 7 | 10 | 15E | ||||
| 3 | B – 2 | 15 | 55E | ||||
| 4 | A – 2 | -13 | 52E | ||||
| 5 | B – 9 | -16 | 20E | ||||
| 6 | G – 4 | -19 | 6E | ||||
| 7 | B – 3 | -32 | 38W | ||||
| 8 | ? – 6 | -20 | 8SW | ||||
| 9 | J – 1 | 16 | 71W | ||||
| 10 | C – 7 | 7 | 2SW |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.