Daily Sunspot Evaluation
Observation Sheet Sunday, 20 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)
- 11
- Number of spots (f)
- 84
- Relative number (R)
- 194
- Observer
- AT
- Reading
- all checks consistent
- File
- 19690420.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 2 | 23 | 02E | 43 | |||
| 2 | A – 1 | 3 | 39E | 6 | |||
| 3 | B – 6 | -10 | 03E | 42 | |||
| 4 | C – 4 | -19 | 17W | 62 | |||
| 5 | J – 2 | -14 | 17W | 62 | |||
| 6 | C – 20 | -13 | 46W | 91 | |||
| 7 | C – 5 | -6 | 68W | 113 | |||
| 8 | D – 9 | 9 | 45W | 90 | |||
| 9 | A – 1 | 11 | 42W | 87 | |||
| 10 | A – 4 | 22 | 40W | 85 | |||
| 11 | H – 30 | 22 | 15W | 60 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.