Daily Sunspot Evaluation
Observation Sheet Tuesday, 9 December 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)
- 14
- Relative number (R)
- 54
- Observer
- SM
- Reading
- all checks consistent
- File
- 19691209.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | C – 8 | -20 | 19W | 225 | |||
| 2 | J – 2 | -21 | 64W | 270 | |||
| 3 | B – 3 | 7 | 53W | 259 | |||
| 4 | J – 1 | 17 | 17W | 223 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.