Daily Sunspot Evaluation
Observation Sheet Sunday, 7 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)
- 40
- Relative number (R)
- 110
- Observer
- LT
- Reading
- all checks consistent
- File
- 19680407.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 3 | 24 | 70E | 284 | |||
| 2 | D – 21 | -22 | 17E | 337 | |||
| 3 | A – 2 | -17 | 28W | 22 | |||
| 4 | ? – 4 | -23 | 81W | 75 | |||
| 5 | A – 2 | -20 | 42W | 36 | |||
| 6 | D – 6 | 9 | 52W | 46 | |||
| 7 | A – 2 | 19 | 10W | 4 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.