Daily Sunspot Evaluation
Observation Sheet Monday, 1 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)
- 52
- Relative number (R)
- 142
- Observer
- KA
- Reading
- all checks consistent
- File
- 19570401.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 1 | -20 | 88E | ||||
| 2 | B – 2 | -24 | 52E | ||||
| 3 | A – 3 | -23 | 20E | ||||
| 4 | H – 13 | -16 | 34W | ||||
| 5 | D – 4 | -14 | 80W | ||||
| 6 | B – 2 | 9 | 49W | ||||
| 7 | A – 2 | 31 | 69W | ||||
| 8 | D – 9 | 12 | 26W | ||||
| 9 | D – 16 | 26 | 32W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.