Daily Sunspot Evaluation
Observation Sheet Sunday, 7 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)
- 37
- Relative number (R)
- 127
- Observer
- ET
- Reading
- all checks consistent
- File
- 19570407.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | C – 5 | -20 | 69E | ||||
| 2 | C – 7 | -19 | 29E | ||||
| 3 | C – 3 | -19 | 8E | ||||
| 4 | A – 1 | -28 | 0 | ||||
| 5 | H – 8 | -22 | 24W | ||||
| 6 | A – 1 | -23 | 56W | ||||
| 7 | B – 7 | 15 | 46W | ||||
| 8 | C – 4 | 22 | 22W | ||||
| 9 | J – 1 | 11 | 7W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.