Daily Sunspot Evaluation
Observation Sheet Saturday, 15 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)
- 5
- Number of spots (f)
- 32
- Relative number (R)
- 82
- Observer
- AB
- Reading
- all checks consistent
- File
- 19610415.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | C – 20 | 14 | 20E | ||||
| 2 | H – 3 | 3 | 26E | ||||
| 3 | C – 6 | -29 | 1E | ||||
| 4 | ? – 1 | -5 | 85W | ||||
| 5 | B – 2 | 2 | 28W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.