Daily Sunspot Evaluation
Observation Sheet Thursday, 11 April 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)
- 8
- Number of spots (f)
- 42
- Relative number (R)
- 122
- Observer
- FY
- Reading
- all checks consistent
- File
- 19570411.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 1 | 15 | 30E | ||||
| 2 | G – 9 | -19 | 7E | ||||
| 3 | C – 7 | -23 | 10E | ||||
| 4 | C – 6 | -19 | 27W | ||||
| 5 | C – 10 | -27 | 54W | ||||
| 6 | A – 2 | -21 | 45W | ||||
| 7 | G – 3 | 22 | 74W | ||||
| 8 | G – 4 | 26 | 59W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.