Daily Sunspot Evaluation
Observation Sheet Friday, 27 July 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)
- 5
- Number of spots (f)
- 39
- Relative number (R)
- 89
- Observer
- ET
- Reading
- all checks consistent
- File
- 19510727.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | C – 16 | 0.24 | 156 | |
| 2 | C – 7 | 0.22 | 224 | |
| 3 | B – 3 | 0.59 | 245 | |
| 4 | J – 4 | 0.74 | 268 | |
| 5 | B – 9 | 0.47 | 270 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.