Daily Sunspot Evaluation
Observation Sheet Friday, 31 May 1957
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)
- 7
- Number of spots (f)
- 31
- Relative number (R)
- 101
- Observer
- MH
- Reading
- all checks consistent
- File
- 19570531.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | H – 5 | -17 | 56E | ||||
| 2 | C – 14 | -17 | 26E | ||||
| 3 | H – 1 | -24 | 18E | ||||
| 4 | H – 8 | -23 | 20W | ||||
| 5 | ? – 1 | -10 | 69W | ||||
| 6 | ? – 1 | 26 | 75W | ||||
| 7 | H – 1 | 22 | 48W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.