Daily Sunspot Evaluation
Observation Sheet Wednesday, 21 February 1951
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)
- 21
- Relative number (R)
- 41
- Observer
- WG
- Reading
- all checks consistent
- File
- 19510221.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | G – 20 | 0.73 | 48 | |
| 2 | J – 1 | 0.82 | 269 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.