Daily Sunspot Evaluation
Observation Sheet Wednesday, 13 April 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)
- 7
- Number of spots (f)
- 61
- Relative number (R)
- 131
- Observer
- BG
- Reading
- all checks consistent
- File
- 19600413.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | E – 27 | 12 | 3E | ||||
| 2 | B – 7 | 29 | 25E | ||||
| 3 | ? – 1 | 9 | 78E | ||||
| 4 | E – 14 | -11 | 38E | ||||
| 5 | J – 2 | -11 | 22E | ||||
| 6 | C – 9 | -9 | 35W | ||||
| 7 | A – 1 | -29 | 21W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.