Daily Sunspot Evaluation
Observation Sheet Monday, 20 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)
- 4
- Number of spots (f)
- 27
- Relative number (R)
- 67
- Observer
- EH
- Reading
- all checks consistent
- File
- 19700420.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | D – 7 | 18 | 02E | 265 | |||
| 2 | D – 9 | 20 | 49E | 218 | |||
| 3 | G – 10 | -8 | 07W | 274 | |||
| 4 | A – 1 | 12 | 58W | 325 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.