Daily Sunspot Evaluation
Observation Sheet Sunday, 20 July 1958
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)
- 15
- Number of spots (f)
- 94
- Relative number (R)
- 244
- Observer
- MH
- Reading
- all checks consistent
- File
- 19580720.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | G – 22 | 19 | 6E | ||||
| 2 | ? – 1 | 17 | 82E | ||||
| 3 | ? – 1 | 16 | 73E | ||||
| 4 | A – 2 | 6 | 12E | ||||
| 5 | ? – 1 | -4 | 75E | ||||
| 6 | ? – 1 | -18 | 68E | ||||
| 7 | D – 14 | -15 | 41E | ||||
| 8 | A – 4 | -14 | 28E | ||||
| 9 | A – 1 | -21 | 21W | ||||
| 10 | D – 12 | -23 | 63W | ||||
| 11 | J – 3 | -3 | 20W | ||||
| 12 | A – 1 | -13 | 47W | ||||
| 13 | E – 29 | 9 | 27W | ||||
| 14 | J – 1 | 17 | 70W | ||||
| 15 | A – 1 | 9 | 7W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.