Daily Sunspot Evaluation
Observation Sheet Friday, 12 September 1969
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)
- 4
- Number of spots (f)
- 22
- Relative number (R)
- 62
- Observer
- AT
- Reading
- all checks consistent
- File
- 19690912.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | G – 3 | 14 | 55E | 232 | |||
| 2 | H – 6 | -19 | 38E | 249 | |||
| 3 | E – 11 | -33 | 38W | 325 | |||
| 4 | A – 2 | 23 | 56W | 343 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.