Daily Sunspot Evaluation
Observation Sheet Thursday, 4 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)
- 57
- Relative number (R)
- 177
- Observer
- WG
- Reading
- all checks consistent
- File
- 19570404.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 2 | 20 | 18E | ||||
| 2 | B – 6 | 9 | 37E | ||||
| 3 | C – 7 | -20 | 50E | ||||
| 4 | E – 12 | -22 | 14E | ||||
| 5 | B – 3 | -21 | 13W | ||||
| 6 | B – 5 | -12 | 18W | ||||
| 7 | E – 13 | -16 | 74W | ||||
| 8 | A – 2 | 14 | 62W | ||||
| 9 | A – 1 | 14 | 52W | ||||
| 10 | A – 3 | 17 | 48W | ||||
| 11 | ? – 2 | 27 | 75W | ||||
| 12 | J – 1 | 29 | 67W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.