Daily Sunspot Evaluation
Observation Sheet Sunday, 20 September 1959
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)
- 57
- Relative number (R)
- 147
- Observer
- AK
- Reading
- all checks consistent
- File
- 19590920.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | 25 | 49E | ||||
| 2 | A – 7 | 2 | 27E | ||||
| 3 | H – 11 | -9 | 54E | ||||
| 4 | B – 3 | -20 | 17E | ||||
| 5 | C – 5 | -12 | 1E | ||||
| 6 | C – 7 | -10 | 5W | ||||
| 7 | B – 9 | -15 | 22W | ||||
| 8 | J – 2 | 5 | 49W | ||||
| 9 | C – 12 | 15 | 9W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.