Daily Sunspot Evaluation
Observation Sheet Friday, 21 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)
- 9
- Number of spots (f)
- 108
- Relative number (R)
- 198
- Observer
- AT
- Reading
- all checks consistent
- File
- 19690221.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 8 | 19 | 15E | 75 | |||
| 2 | E – 46 | 13 | 25E | 65 | |||
| 3 | D – 20 | 13 | 44E | 49 | |||
| 4 | C – 14 | -14 | 19E | 71 | |||
| 5 | C – 9 | -14 | 37W | 127 | |||
| 6 | ? – 3 | -11 | 72W | 162 | |||
| 7 | A – 2 | 7 | 14W | 104 | |||
| 8 | A – 3 | 20 | 17W | 107 | |||
| 9 | A – 3 | 11 | 02W | 92 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.