Daily Sunspot Evaluation
Observation Sheet Thursday, 17 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)
- 10
- Number of spots (f)
- 82
- Relative number (R)
- 182
- Observer
- FY
- Reading
- all checks consistent
- File
- 19580717.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | C – 7 | 21 | 49E | ||||
| 2 | F – 33 | 9 | 14E | ||||
| 3 | A – 1 | 8 | 35E | ||||
| 4 | H – 5 | -4 | 22E | ||||
| 5 | J – 3 | -20 | 18E | ||||
| 6 | A – 2 | -13 | 7W | ||||
| 7 | E – 23 | -24 | 21W | ||||
| 8 | J – 2 | -22 | 54W | ||||
| 9 | D – 4 | 16 | 26W | ||||
| 10 | A – 2 | 40 | 5W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.