Daily Sunspot Evaluation
Observation Sheet Saturday, 16 September 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)
- 53
- Relative number (R)
- 103
- Observer
- PO
- Reading
- all checks consistent
- File
- 19610916.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | 18 | 73E | ||||
| 2 | F – 27 | -12 | 20W | ||||
| 3 | E – 10 | 14 | 5W | ||||
| 4 | R – 3 | 10 | 51W | ||||
| 5 | B – 12 | 21 | 36W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.