Daily Sunspot Evaluation
Observation Sheet Friday, 18 December 1964
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)
- 8
- Relative number (R)
- 38
- Observer
- SB
- Reading
- all checks consistent
- File
- 19641218.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 3 | 24 | 10E | ||||
| 2 | ? – 1 | 34 | 78E | ||||
| 3 | C – 4 | -10 | 45E |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.