Daily Sunspot Evaluation
Observation Sheet Sunday, 20 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)
- 10
- Number of spots (f)
- 87
- Relative number (R)
- 187
- Observer
- FY
- Reading
- all checks consistent
- File
- 19580420.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | C – 2 | 40 | 11E | ||||
| 2 | D – 7 | 23 | 10E | ||||
| 3 | C – 8 | 13 | 40E | ||||
| 4 | ? – 2 | 7 | 74E | ||||
| 5 | A – 1 | -6 | 63E | ||||
| 6 | F – 41 | -21 | 10E | ||||
| 7 | B – 6 | -25 | 48W | ||||
| 8 | A – 1 | 20 | 71W | ||||
| 9 | D – 16 | 18 | 16W | ||||
| 10 | C – 3 | 36 | 24W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.