Daily Sunspot Evaluation
Observation Sheet Tuesday, 9 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)
- 3
- Number of spots (f)
- 21
- Relative number (R)
- 51
- Observer
- TY
- Reading
- all checks consistent
- File
- 19690909.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 1 | -20 | 80E | 247 | |||
| 2 | D – 15 | -33 | 02E | 325 | |||
| 3 | C – 5 | 22 | 15W | 342 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.