Daily Sunspot Evaluation
Observation Sheet Tuesday, 30 July 1957
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)
- 9
- Number of spots (f)
- 60
- Relative number (R)
- 150
- Observer
- ET
- Reading
- all checks consistent
- File
- 19570730.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | E – 13 | 25 | 70E | ||||
| 2 | A – 2 | 10 | 62E | ||||
| 3 | A – 1 | -2 | 27E | ||||
| 4 | H – 16 | -30 | 39E | ||||
| 5 | J – 2 | -28 | 23E | ||||
| 6 | H – 1 | -13 | 12W | ||||
| 7 | C – 15 | 12 | 52W | ||||
| 8 | B – 9 | 21 | 46W | ||||
| 9 | ? – 1 | 33 | 84W.E |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.