Daily Sunspot Evaluation
Observation Sheet Saturday, 1 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)
- 7
- Number of spots (f)
- 51
- Relative number (R)
- 121
- Observer
- AB
- Reading
- all checks consistent
- File
- 19610401.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | C – 6 | -17 | 33E | ||||
| 2 | C – 6 | -17 | 23E | ||||
| 3 | H – 6 | -19 | 6E | ||||
| 4 | C – 26 | -13 | 9W | ||||
| 5 | A – 1 | -10 | 28W | ||||
| 6 | H – 1 | 8 | 25W | ||||
| 7 | B – 5 | 8 | 71W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.