Daily Sunspot Evaluation
Observation Sheet Saturday, 18 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)
- 12
- Number of spots (f)
- 77
- Relative number (R)
- 197
- Observer
- WG
- Reading
- all checks consistent
- File
- 19570518.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 3 | 23 | 20E | ||||
| 2 | D – 15 | 8 | 35E | ||||
| 3 | ? – 2 | -11 | 85E | ||||
| 4 | B – 16 | -23 | 26E | ||||
| 5 | A – 1 | -38 | 63E | ||||
| 6 | J – 1 | -13 | 5E | ||||
| 7 | B – 2 | -16 | 11W | ||||
| 8 | E – 18 | -10 | 15W | ||||
| 9 | ? – 4 | -17 | 78W | ||||
| 10 | J – 1 | 21 | 32W | ||||
| 11 | C – 6 | 18 | 22W | ||||
| 12 | B – 8 | 28 | 26W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.