Daily Sunspot Evaluation
Observation Sheet Wednesday, 17 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)
- 8
- Number of spots (f)
- 27
- Relative number (R)
- 107
- Observer
- LT
- Reading
- all checks consistent
- File
- 19680417.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | 25 | 41E | 178 | |||
| 2 | A – 2 | 29 | 49E | 170 | |||
| 3 | C – 2 | -11 | 40E | 179 | |||
| 4 | B – 4 | -14 | 29W | 248 | |||
| 5 | C – 3 | -11 | 61W | 280 | |||
| 6 | A – 2 | 22 | 66W | 285 | |||
| 7 | E – 12 | 24 | 29W | 248 | |||
| 8 | J – 1 | 33 | 6W | 225 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.