Daily Sunspot Evaluation
Observation Sheet Tuesday, 9 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)
- 10
- Number of spots (f)
- 77
- Relative number (R)
- 177
- Observer
- MH
- Reading
- all checks consistent
- File
- 19570409.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 3 | 16 | 61E | ||||
| 2 | E – 21 | -20 | 35E | ||||
| 3 | C – 11 | -19 | 2E | ||||
| 4 | B – 4 | -20 | 16W | ||||
| 5 | E – 15 | -27 | 26W | ||||
| 6 | B – 4 | -23 | 51W | ||||
| 7 | ? – 1 | 13 | 80W | ||||
| 8 | A – 1 | 15 | 70W | ||||
| 9 | E – 10 | 21 | 46W | ||||
| 10 | G – 7 | 26 | 31W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.