Daily Sunspot Evaluation
Observation Sheet Saturday, 20 September 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)
- 89
- Relative number (R)
- 189
- Observer
- AB
- Reading
- all checks consistent
- File
- 19580920.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | C – 15 | 11 | 30E | ||||
| 2 | B – 3 | -22 | 7E | ||||
| 3 | F – 27 | -18 | 9WEE | ||||
| 4 | H – 10 | -16 | 22W | ||||
| 5 | J – 3 | -13 | 31W | ||||
| 6 | G – 3 | -33 | 46W | ||||
| 7 | J – 1 | -12 | 74W | ||||
| 8 | G – 5 | 15 | 46W | ||||
| 9 | A – 2 | 17 | 33W | ||||
| 10 | O – 20 | 23 | 1W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.