Daily Sunspot Evaluation
Observation Sheet Monday, 15 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)
- 7
- Number of spots (f)
- 42
- Relative number (R)
- 112
- Observer
- KA
- Reading
- all checks consistent
- File
- 19570415.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | C – 3 | 23 | 47E | ||||
| 2 | C – 2 | -18 | 64E | ||||
| 3 | A – 1 | -27 | 45E | ||||
| 4 | D – 10 | -24 | 12W | ||||
| 5 | E – 20 | -23 | 41W | ||||
| 6 | G – 2 | 31 | 53W | ||||
| 7 | B – 4 | 12 | 3W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.