Daily Sunspot Evaluation
Observation Sheet Tuesday, 12 February 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)
- 59
- Relative number (R)
- 159
- Observer
- ET
- Reading
- all checks consistent
- File
- 19570212.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 4 | 13 | 15E | ||||
| 2 | ? – 4 | 16 | 78E | ||||
| 3 | ? – 2 | 9 | 76E | ||||
| 4 | A – 5 | -23 | 65E | ||||
| 5 | C – 10 | -25 | 33E | ||||
| 6 | B – 8 | -22 | 2E | ||||
| 7 | C – 12 | -26 | 11W | ||||
| 8 | H – 1 | -26 | 28W | ||||
| 9 | A – 3 | -21 | 65W | ||||
| 10 | C – 10 | -15 | 61W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.