Daily Sunspot Evaluation
Observation Sheet Friday, 15 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)
- 12
- Number of spots (f)
- 37
- Relative number (R)
- 157
- Observer
- FY
- Reading
- all checks consistent
- File
- 19570215.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 4 | 14 | 3E | ||||
| 2 | C – 4 | 16 | 36E | ||||
| 3 | J – 1 | 9 | 36E | ||||
| 4 | C – 2 | 13 | 48E | ||||
| 5 | B – 2 | 8 | 48E | ||||
| 6 | D – 6 | -22 | 53E | ||||
| 7 | J – 1 | -26 | 72E | ||||
| 8 | A – 1 | -25 | 8W | ||||
| 9 | C – 4 | -27 | 48W | ||||
| 10 | H – 1 | -26 | 67W | ||||
| 11 | C – 9 | -22 | 35W | ||||
| 12 | B – 2 | -8 | 29W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.