Daily Sunspot Evaluation
Observation Sheet Friday, 12 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)
- 5
- Number of spots (f)
- 24
- Relative number (R)
- 74
- Observer
- ET
- Reading
- all checks consistent
- File
- 19570712.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 2 | 33 | 0 | ||||
| 2 | J – 3 | 8 | 27E | ||||
| 3 | J – 1 | -17 | 66E | ||||
| 4 | E – 13 | -32 | 30E | ||||
| 5 | G – 5 | -11 | 26W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.