Daily Sunspot Evaluation
Observation Sheet Thursday, 18 July 1968
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
- SM
- Reading
- all checks consistent
- File
- 19680718.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 2 | 11 | 80E | 3 | |||
| 2 | J – 1 | -17 | 46E | 37 | |||
| 3 | J – 1 | -14 | 29W | 111 | |||
| 4 | A – 3 | -16 | 70W | 153 | |||
| 5 | A – 1 | -5 | 39W | 122 | |||
| 6 | ? – 4 | 11 | 80W | 163 | |||
| 7 | H – 8 | 13 | 10W | 93 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.