Daily Sunspot Evaluation
Observation Sheet Tuesday, 13 August 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)
- 36
- Relative number (R)
- 126
- Observer
- FY
- Reading
- all checks consistent
- File
- 19570813.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | H – 7 | 13 | 9E | ||||
| 2 | J – 1 | 22 | 56E | ||||
| 3 | A – 2 | -10 | 33E | ||||
| 4 | C – 4 | -10 | 23E | ||||
| 5 | ? – 3 | -33 | 73E | ||||
| 6 | A – 1 | -18 | 11E | ||||
| 7 | C – 3 | -31 | 7E | ||||
| 8 | A – 1 | -20 | 45W | ||||
| 9 | E – 14 | 17 | 3W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.