Daily Sunspot Evaluation
Observation Sheet Thursday, 27 September 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)
- 25
- Relative number (R)
- 75
- Observer
- WG
- Reading
- all checks consistent
- File
- 19510927.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | A – 4 | 0.6 | 90 | |
| 2 | A – 1 | 0.91 | 130 | |
| 3 | C – 8 | 0.75 | 301 | |
| 4 | B – 5 | 0.87 | 302 | |
| 5 | G – 7 | 0.85 | 311 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.