Daily Sunspot Evaluation
Observation Sheet Tuesday, 20 September 1966
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)
- 3
- Number of spots (f)
- 49
- Relative number (R)
- 79
- Observer
- DK
- Reading
- all checks consistent
- File
- 19660920.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | E – 27 | 21 | 13°E | 2.32 | |||
| 2 | H – 16 | 7 | 12°W | 2.35 | |||
| 3 | B – 6 | 19 | 50°W | 2.95 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.