Daily Sunspot Evaluation
Observation Sheet Friday, 18 December 1959
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)
- 8
- Number of spots (f)
- 52
- Relative number (R)
- 132
- Observer
- FY
- Reading
- all checks consistent
- File
- 19591218.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | C – 8 | 11 | 18E | ||||
| 2 | A – 1 | 23 | 66E | ||||
| 3 | J – 1 | 17 | 69E | ||||
| 4 | D – 9 | -16 | 43E | ||||
| 5 | D – 7 | -8 | 54W | ||||
| 6 | H – 17 | -2 | 17W | ||||
| 7 | J – 1 | 7 | 22W | ||||
| 8 | H – 8 | 18 | 41W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.