Daily Sunspot Evaluation
Observation Sheet Monday, 21 April 1958
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)
- 12
- Number of spots (f)
- 114
- Relative number (R)
- 234
- Observer
- WG
- Reading
- all checks consistent
- File
- 19580421.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | H – 7 | 13 | 27E | ||||
| 2 | ? – 1 | 17 | 82E | ||||
| 3 | D – 7 | 8 | 65E | ||||
| 4 | A – 2 | -6 | 49E | ||||
| 5 | A – 2 | -13 | 62E | ||||
| 6 | F – 47 | -22 | 2W | ||||
| 7 | B – 5 | -26 | 61W | ||||
| 8 | D – 28 | 18 | 29W | ||||
| 9 | J – 1 | 35 | 37W | ||||
| 10 | B – 2 | 13 | 1W | ||||
| 11 | D – 9 | 24 | 2W | ||||
| 12 | C – 3 | 40 | 1W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.