Daily Sunspot Evaluation
Observation Sheet Saturday, 23 February 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)
- 50
- Relative number (R)
- 120
- Observer
- WG
- Reading
- all checks consistent
- File
- 19570223.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | D – 16 | 15 | 25E | ||||
| 2 | C – 2 | 19 | 46E | ||||
| 3 | J – 5 | -28 | 31W | ||||
| 4 | D – 13 | -21 | 55W | ||||
| 5 | G – 6 | 9 | 59W | ||||
| 6 | A – 1 | 16 | 69W | ||||
| 7 | C – 7 | 17 | 12W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.