Daily Sunspot Evaluation
Observation Sheet Saturday, 17 September 1977
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)
- 39
- Relative number (R)
- 69
- Observer
- FA
- Reading
- all checks consistent
- File
- 19770917.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 1 | 26 | 60E | 113 | 59E | ||
| 2 | F – 30 | 8 | 23W | 196 | 24W | ||
| 3 | D – 8 | 16 | 33W | 206 | 34W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.