Daily Sunspot Evaluation
Observation Sheet Saturday, 20 September 1975
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)
- 15
- Relative number (R)
- 45
- Observer
- SK
- Reading
- all checks consistent
- File
- 19750920.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 3 | 6 | 39E | 24 | 36E | ||
| 2 | A – 2 | 3 | 24W | 87 | 27W | ||
| 3 | B – 10 | 9 | 25W | 88 | 28W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.