Daily Sunspot Evaluation
Observation Sheet Tuesday, 9 April 1968
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)
- 7
- Number of spots (f)
- 45
- Relative number (R)
- 115
- Observer
- AT
- Reading
- all checks consistent
- File
- 19680409.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | D – 8 | 24 | 45E | 283 | |||
| 2 | ? – 2 | 24 | 77E | 251 | |||
| 3 | A – 1 | -11 | 24E | 304 | |||
| 4 | D – 23 | -22 | 6W | 334 | |||
| 5 | D – 9 | -16 | 57W | 25 | |||
| 6 | J – 1 | 8 | 75W | 43 | |||
| 7 | A – 1 | 31 | 11W | 339 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.