Daily Sunspot Evaluation
Observation Sheet Thursday, 6 April 1961
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)
- 6
- Number of spots (f)
- 75
- Relative number (R)
- 135
- Observer
- KA
- Reading
- all checks consistent
- File
- 19610406.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | -3 | 36E | ||||
| 2 | B – 15 | -16 | 35W | ||||
| 3 | C – 10 | -17 | 45W | ||||
| 4 | J – 2 | -18 | 62W | ||||
| 5 | C – 16 | -8 | 46W | ||||
| 6 | E – 31 | 14 | 4W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.