Daily Sunspot Evaluation
Observation Sheet Saturday, 13 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)
- 7
- Number of spots (f)
- 20
- Relative number (R)
- 90
- Observer
- MH
- Reading
- all checks consistent
- File
- 19570713.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | A – 2 | 8 | 13 | |
| 2 | ? – 1 | 14 | 79 | |
| 3 | J – 1 | -17 | 52 | |
| 4 | ? – 1 | -36 | 72 | |
| 5 | H – 10 | -33 | 16 | |
| 6 | G – 4 | -12 | 41 | |
| 7 | J – 1 | 33 | 14 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.