Daily Sunspot Evaluation
Observation Sheet Tuesday, 23 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)
- 18
- Number of spots (f)
- 157
- Relative number (R)
- 337
- Observer
- ET
- Reading
- all checks consistent
- File
- 19570723.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | D – 15 | 31 | 9E | ||||
| 2 | F – 50 | 10 | 37E | ||||
| 3 | ? – 1 | -14 | 79E | ||||
| 4 | A – 2 | -16 | 44E | ||||
| 5 | E – 22 | -23 | 6W | ||||
| 6 | A – 2 | -32 | 9W | ||||
| 7 | A – 1 | -34 | 15W | ||||
| 8 | A – 1 | -36 | 53W | ||||
| 9 | C – 10 | -19 | 50W | ||||
| 10 | ? – 1 | -18 | 78W | ||||
| 11 | C – 8 | -9 | 47W | ||||
| 12 | C – 13 | 13 | 54W | ||||
| 13 | A – 2 | 24 | 42W | ||||
| 14 | H – 5 | 22 | 33W | ||||
| 15 | B – 4 | 14 | 73W | ||||
| 16 | C – 5 | 26 | 24W | ||||
| 17 | A – 2 | 30 | 19W | ||||
| 18 | B – 13 | 30 | 10W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.