Daily Sunspot Evaluation
Observation Sheet Tuesday, 30 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)
- 12
- Number of spots (f)
- 40
- Relative number (R)
- 160
- Observer
- WG
- Reading
- all checks consistent
- File
- 19570430.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 1 | 16 | 4E | ||||
| 2 | J – 2 | 25 | 26E | ||||
| 3 | A – 2 | 27 | 39E | ||||
| 4 | A – 1 | 22 | 35E | ||||
| 5 | A – 1 | 25 | 50E | ||||
| 6 | J – 2 | -11 | 0 | ||||
| 7 | C – 8 | -5 | 2W | ||||
| 8 | B – 2 | -27 | 21W | ||||
| 9 | B – 6 | -18 | 23W | ||||
| 10 | H – 7 | -16 | 35W | ||||
| 11 | G – 7 | -10 | 31W | ||||
| 12 | J – 1 | -14 | 77W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.