Daily Sunspot Evaluation
Observation Sheet Tuesday, 12 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)
- 10
- Number of spots (f)
- 80
- Relative number (R)
- 180
- Observer
- ET
- Reading
- all checks consistent
- File
- 19600412.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 6 | 28 | 38E | ||||
| 2 | ? – 2 | 18 | 34E | ||||
| 3 | E – 34 | 11 | 20E | ||||
| 4 | E – 16 | -12 | 55E | ||||
| 5 | J – 2 | -12 | 38E | ||||
| 6 | J – 2 | -17 | 55W | ||||
| 7 | ? – 1 | -7 | 72W | ||||
| 8 | H – 13 | -11 | 20W | ||||
| 9 | J – 1 | 28 | 4W | ||||
| 10 | B – 3 | 29 | 1W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.