Daily Sunspot Evaluation
Observation Sheet Tuesday, 17 December 1985
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)
- 2
- Number of spots (f)
- 41
- Relative number (R)
- 61
- Observer
- HM
- Reading
- all checks consistent
- File
- 19851217.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DAO – 21 | 3 | 22W | 28 | 24W | 7 | |
| 2 | EAI – 20 | 6 | 02W | 10.5 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.