Daily Sunspot Evaluation
Observation Sheet Saturday, 7 September 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)
- 4
- Number of spots (f)
- 42
- Relative number (R)
- 82
- Observer
- FY
- Reading
- all checks consistent
- File
- 19570907.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | F – 20 | 11 | 45E | ||||
| 2 | B – 4 | -13 | 42E | ||||
| 3 | C – 2 | -11 | 3E | ||||
| 4 | E – 16 | -24 | 8W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.