Daily Sunspot Evaluation
Observation Sheet Friday, 18 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)
- 86
- Relative number (R)
- 186
- Observer
- FY
- Reading
- all checks consistent
- File
- 19580718.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | F – 27 | 9 | 1E | ||||
| 2 | C – 14 | 21 | 36E | ||||
| 3 | B – 5 | 8 | 23E | ||||
| 4 | H – 7 | -4 | 10E | ||||
| 5 | A – 2 | -20 | 6E | ||||
| 6 | D – 24 | -23 | 35W | ||||
| 7 | J – 1 | -23 | 68W | ||||
| 8 | A – 1 | 10 | 26W | ||||
| 9 | C – 3 | 16 | 39W | ||||
| 10 | A – 2 | 40 | 16W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.