Daily Sunspot Evaluation
Observation Sheet Tuesday, 19 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)
- 41
- Relative number (R)
- 111
- Observer
- ET
- Reading
- all checks consistent
- File
- 19570219.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 2 | -14 | 63E | ||||
| 2 | J – 2 | -27 | 22E | ||||
| 3 | E – 31 | -22 | 2E | ||||
| 4 | A – 1 | -18 | 16W | ||||
| 5 | B – 2 | -10 | 46W | ||||
| 6 | J – 2 | 9 | 17W | ||||
| 7 | J – 1 | 15 | 14W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.