Daily Sunspot Evaluation
Observation Sheet Sunday, 16 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)
- 31
- Relative number (R)
- 91
- Observer
- SK
- Reading
- all checks consistent
- File
- 19610416.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | D – 16 | 15 | 4E | ||||
| 2 | H – 5 | 4 | 14E | ||||
| 3 | J – 1 | 8 | 79E | ||||
| 4 | B – 4 | -10 | 37E | ||||
| 5 | J – 1 | -10 | 77E | ||||
| 6 | B – 4 | -28 | 13W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.