Daily Sunspot Evaluation
Observation Sheet Wednesday, 31 July 1974
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)
- 3
- Number of spots (f)
- 24
- Relative number (R)
- 54
- Observer
- FA
- Reading
- all checks consistent
- File
- 19740731.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 4 | -15 | 11W | 166 | |||
| 2 | C – 18 | -10 | 21W | 176 | |||
| 3 | A – 2 | -9 | 58W | 213 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.