Daily Sunspot Evaluation
Observation Sheet Wednesday, 18 September 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)
- 5
- Number of spots (f)
- 30
- Relative number (R)
- 80
- Observer
- SM
- Reading
- all checks consistent
- File
- 19680918.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 1 | 21 | 11°E | 335 | |||
| 2 | J – 1 | 16 | 48°E | 298 | |||
| 3 | J – 2 | 2 | 76°E | 270 | |||
| 4 | H – 23 | -18 | 44°W | 30 | |||
| 5 | J – 3 | 6 | 37°W | 23 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.