Daily Sunspot Evaluation
Observation Sheet Wednesday, 31 July 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)
- 87
- Relative number (R)
- 137
- Observer
- SM
- Reading
- all checks consistent
- File
- 19680731.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 4 | 23 | 63E | 210 | |||
| 2 | D – 39 | 7 | 5W | 278 | |||
| 3 | H – 5 | 11 | 69W | 342 | |||
| 4 | B – 11 | 30 | 47W | 320 | |||
| 5 | D – 28 | 14 | 4W | 277 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.