Daily Sunspot Evaluation
Observation Sheet Friday, 20 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)
- 6
- Number of spots (f)
- 21
- Relative number (R)
- 81
- Observer
- AT
- Reading
- all checks consistent
- File
- 19680920.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | H – 3 | 14 | 22E | 297 | |||
| 2 | G – 9 | 16 | 67E | 252 | |||
| 3 | C – 5 | 3 | 50E | 269 | |||
| 4 | A – 1 | 4 | 38E | 281 | |||
| 5 | J – 2 | -15 | 68W | 27 | |||
| 6 | J – 1 | 6 | 64W | 23 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.