Daily Sunspot Evaluation
Observation Sheet Saturday, 16 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)
- 13
- Number of spots (f)
- 49
- Relative number (R)
- 179
- Observer
- WG
- Reading
- all checks consistent
- File
- 19570216.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | 16 | 24E | ||||
| 2 | J – 2 | 9 | 22E | ||||
| 3 | A – 2 | 13 | 34E | ||||
| 4 | A – 1 | 8 | 32E | ||||
| 5 | D – 16 | -22 | 40E | ||||
| 6 | J – 1 | -26 | 58E | ||||
| 7 | A – 1 | -25 | 20W | ||||
| 8 | J – 2 | -26 | 79W | ||||
| 9 | B – 3 | -26 | 61W | ||||
| 10 | B – 6 | -21 | 48W | ||||
| 11 | B – 5 | -9 | 42W | ||||
| 12 | B – 3 | 13 | 33W | ||||
| 13 | B – 6 | 14 | 10W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.