Daily Sunspot Evaluation
Observation Sheet Sunday, 18 December 1955
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)
- 5
- Number of spots (f)
- 40
- Relative number (R)
- 90
- Observer
- WG
- Reading
- all checks consistent
- File
- 19551218.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | J – 1 | 0.91 | 121 | |
| 2 | G – 7 | 0.53 | 169 | |
| 3 | B – 5 | 0.41 | 228 | |
| 4 | E – 21 | 0.58 | 319 | |
| 5 | H – 6 | 0.48 | 343 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.