Daily Sunspot Evaluation
Observation Sheet Sunday, 12 April 1970
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)
- 3
- Number of spots (f)
- 55
- Relative number (R)
- 85
- Observer
- EH
- Reading
- all checks consistent
- File
- 19700412.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | E – 22 | 17 | 06E | 5 | |||
| 2 | E – 24 | -9 | 49W | 60 | |||
| 3 | D – 9 | 11 | 44W | 55 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.