Daily Sunspot Evaluation
Observation Sheet Thursday, 20 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)
- 84
- Relative number (R)
- 174
- Observer
- SM
- Reading
- all checks consistent
- File
- 19690220.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 9 | 19 | 26E | 76 | |||
| 2 | E – 37 | 13 | 38E | 64 | |||
| 3 | B – 9 | 14 | 54E | 48 | |||
| 4 | B – 5 | -13 | 32E | 70 | |||
| 5 | C – 9 | -14 | 23W | 125 | |||
| 6 | B – 10 | -10 | 58W | 160 | |||
| 7 | A – 1 | 18 | 49W | 151 | |||
| 8 | B – 3 | 20 | 05W | 107 | |||
| 9 | A – 1 | 8 | 03W | 105 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.