Daily Sunspot Evaluation
Observation Sheet Tuesday, 17 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)
- 8
- Number of spots (f)
- 25
- Relative number (R)
- 105
- Observer
- AT
- Reading
- all checks consistent
- File
- 19680917.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 3 | 21 | 24E | 335 | |||
| 2 | J – 1 | 16 | 62E | 297 | |||
| 3 | A – 1 | 13 | 47E | 312 | |||
| 4 | A – 1 | -20 | 14E | 345 | |||
| 5 | H – 4 | -15 | 28W | 27 | |||
| 6 | J – 2 | -11 | 78W | 77 | |||
| 7 | H – 10 | 7 | 24W | 23 | |||
| 8 | A – 3 | 7 | 35W | 35 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.