Daily Sunspot Evaluation
Observation Sheet Saturday, 13 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)
- 5
- Number of spots (f)
- 47
- Relative number (R)
- 97
- Observer
- AT
- Reading
- all checks consistent
- File
- 19680413.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | E – 26 | 24 | 24E | 249 | |||
| 2 | J – 1 | 23 | 42E | 231 | |||
| 3 | C – 3 | -13 | 6W | 279 | |||
| 4 | A – 5 | -21 | 61W | 334 | |||
| 5 | C – 12 | 24 | 10W | 283 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.