Daily Sunspot Evaluation
Observation Sheet Saturday, 28 April 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)
- 6
- Number of spots (f)
- 73
- Relative number (R)
- 133
- Observer
- ET
- Reading
- all checks consistent
- File
- 19510428.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | G – 9 | 0.24 | 75 | |
| 2 | A – 1 | 0.71 | 77 | |
| 3 | E – 25 | 0.73 | 228 | |
| 4 | D – 19 | 0.05 | 238 | |
| 5 | A – 1 | 0.62 | 254 | |
| 6 | D – 18 | 0.54 | 288 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.