Daily Sunspot Evaluation
Observation Sheet Friday, 22 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)
- 8
- Number of spots (f)
- 52
- Relative number (R)
- 132
- Observer
- FY
- Reading
- all checks consistent
- File
- 19570222.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 2 | 20 | 38E | ||||
| 2 | B – 2 | 15 | 38E | ||||
| 3 | C – 3 | 19 | 60E | ||||
| 4 | H – 4 | -28 | 19W | ||||
| 5 | E – 21 | -21 | 42W | ||||
| 6 | A – 1 | 11 | 63W | ||||
| 7 | D – 18 | 9 | 46W | ||||
| 8 | A – 1 | 16 | 57W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.