Daily Sunspot Evaluation
Observation Sheet Friday, 4 April 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)
- 7
- Number of spots (f)
- 80
- Relative number (R)
- 150
- Observer
- MÖ
- Reading
- all checks consistent
- File
- 19690404.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | D – 10 | 19 | 0 | 256 | |||
| 2 | C – 8 | 21 | 11E | 245 | |||
| 3 | H – 5 | 9 | 63E | 193 | |||
| 4 | B – 2 | -20 | 79E | 177 | |||
| 5 | A – 3 | -9 | 75W | 331 | |||
| 6 | F – 47 | 10 | 20W | 276 | |||
| 7 | A – 5 | 23 | 50W | 306 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.