Daily Sunspot Evaluation
Observation Sheet Saturday, 6 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)
- 9
- Number of spots (f)
- 47
- Relative number (R)
- 137
- Observer
- WG
- Reading
- all checks consistent
- File
- 19570406.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 6 | 10 | 10E | ||||
| 2 | A – 2 | 11 | 29E | ||||
| 3 | J – 1 | -20 | 77E | ||||
| 4 | C – 9 | -20 | 21E | ||||
| 5 | G – 16 | -23 | 8W | ||||
| 6 | C – 6 | -23 | 40W | ||||
| 7 | J – 1 | 24 | 70W | ||||
| 8 | A – 2 | 14 | 30W | ||||
| 9 | C – 4 | 21 | 7W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.