Daily Sunspot Evaluation
Observation Sheet Saturday, 20 September 1969
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)
- 24
- Relative number (R)
- 74
- Observer
- AT
- Reading
- all checks consistent
- File
- 19690920.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 6 | 13 | 28E | 154 | |||
| 2 | ? – 1 | -9 | 76E | 106 | |||
| 3 | A – 1 | -19 | 67W | 249 | |||
| 4 | B – 15 | -3 | 41W | 223 | |||
| 5 | J – 1 | 14 | 58W | 240 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.