Daily Sunspot Evaluation
Observation Sheet Thursday, 13 February 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)
- 23
- Relative number (R)
- 63
- Observer
- LT
- Reading
- all checks consistent
- File
- 19690213.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | D – 10 | 17 | 04E | 190 | |||
| 2 | A – 2 | -12 | 35E | 159 | |||
| 3 | B – 6 | -15 | 70E | 124 | |||
| 4 | ? – 5 | 13 | 78W | 272 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.