Daily Sunspot Evaluation
Observation Sheet Friday, 17 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)
- 13
- Number of spots (f)
- 54
- Relative number (R)
- 184
- Observer
- MH
- Reading
- all checks consistent
- File
- 19570517.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 1 | 30 | 35E | ||||
| 2 | D – 4 | 24 | 31E | ||||
| 3 | D – 8 | 9 | 46E | ||||
| 4 | C – 9 | 23 | 36E | ||||
| 5 | C – 3 | -13 | 18E | ||||
| 6 | E – 14 | -9 | 5W | ||||
| 7 | A – 3 | -16 | 0 | ||||
| 8 | ? – 2 | -32 | 77W | 2 | |||
| 9 | D – 5 | -17 | 65W | ||||
| 10 | ? – 1 | 12 | 76W | ||||
| 11 | J – 1 | 22 | 23W | ||||
| 12 | J – 1 | 20 | 13W | ||||
| 13 | A – 2 | 29 | 16W | 1 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.