Daily Sunspot Evaluation
Observation Sheet Thursday, 20 June 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)
- 15
- Number of spots (f)
- 132
- Relative number (R)
- 282
- Observer
- WG
- Reading
- all checks consistent
- File
- 19570620.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 1 | 14 | 5E | ||||
| 2 | J – 2 | 26 | 19E | ||||
| 3 | F – 35 | 19 | 28E | ||||
| 4 | A – 4 | 35 | 49E | ||||
| 5 | J – 1 | 29 | 44E | ||||
| 6 | J – 1 | 21 | 51E | ||||
| 7 | F – 9 | -20 | 64E | ||||
| 8 | A – 2 | -13 | 8E | ||||
| 9 | F – 42 | -37 | 10E | ||||
| 10 | D – 10 | -14 | 11W | ||||
| 11 | C – 15 | -16 | 22W | ||||
| 12 | A – 1 | -17 | 47W | ||||
| 13 | A – 1 | 12 | 55W | ||||
| 14 | ? – 6 | 33 | 73W | ||||
| 15 | B – 2 | 46 | 40W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.