Daily Sunspot Evaluation
Observation Sheet Wednesday, 20 April 1966
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)
- 25
- Relative number (R)
- 65
- Observer
- SK
- Reading
- all checks consistent
- File
- 19660420.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | H – 6 | 19 | 50E | 60 | |||
| 2 | ? – 1 | 27 | 90E | 20 | |||
| 3 | C – 8 | 22 | 26W | 136 | |||
| 4 | D – 10 | 21 | 19W | 129 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.