Daily Sunspot Evaluation
Observation Sheet Tuesday, 17 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)
- 3
- Number of spots (f)
- 57
- Relative number (R)
- 87
- Observer
- ET
- Reading
- all checks consistent
- File
- 19510717.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | A – 2 | 0.35 | 219 | |
| 2 | A – 4 | 0.46 | 224 | |
| 3 | E – 51 | 0.58 | 252 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.