Daily Sunspot Evaluation
Observation Sheet Friday, 12 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)
- 64
- Relative number (R)
- 134
- Observer
- KA
- Reading
- all checks consistent
- File
- 19570412.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 9 | 12 | 37E | ||||
| 2 | ? – 1 | -25 | 74E | ||||
| 3 | E – 38 | -23 | 5W | ||||
| 4 | C – 9 | -27 | 67W | ||||
| 5 | C – 4 | -19 | 41W | ||||
| 6 | A – 1 | -20 | 61W | ||||
| 7 | ? – 2 | 26 | 75W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.