Daily Sunspot Evaluation
Observation Sheet Friday, 27 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)
- 93
- Relative number (R)
- 153
- Observer
- ET
- Reading
- all checks consistent
- File
- 19510427.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | A – 2 | 0.19 | 65 | |
| 2 | G – 13 | 0.45 | 68 | |
| 3 | A – 1 | 0.84 | 75 | |
| 4 | E – 44 | 0.57 | 224 | |
| 5 | A – 2 | 0.42 | 257 | |
| 6 | D – 31 | 0.43 | 308 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.