Daily Sunspot Evaluation
Observation Sheet Saturday, 17 September 1960
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)
- 58
- Relative number (R)
- 148
- Observer
- AB
- Reading
- all checks consistent
- File
- 19600917.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 7 | 25 | 9E | ||||
| 2 | A – 1 | 25 | 37E | ||||
| 3 | ? – 1 | 16 | 80E | ||||
| 4 | H – 15 | -18 | 55E | ||||
| 5 | C – 7 | -6 | 23E | ||||
| 6 | C – 14 | -5 | 27W | ||||
| 7 | B – 3 | 16 | 47W | ||||
| 8 | C – 7 | 14 | 26W | ||||
| 9 | B – 3 | 20 | 27W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.