Daily Sunspot Evaluation
Observation Sheet Friday, 19 July 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)
- 15
- Number of spots (f)
- 104
- Relative number (R)
- 254
- Observer
- ET
- Reading
- all checks consistent
- File
- 19570719.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | C – 5 | 16 | 0 | ||||
| 2 | C – 11 | 27 | 12E | ||||
| 3 | E – 16 | 25 | 25E | ||||
| 4 | H – 12 | 31 | 38E | ||||
| 5 | B – 4 | 31 | 63E | ||||
| 6 | B – 14 | -9 | 8E | ||||
| 7 | H – 3 | -22 | 45E | ||||
| 8 | C – 4 | -33 | 37E | ||||
| 9 | A – 3 | -41 | 25E | ||||
| 10 | C – 14 | -18 | 4E | ||||
| 11 | J – 2 | -36 | 3W | ||||
| 12 | B – 5 | -13 | 10W | ||||
| 13 | J – 1 | -17 | 26W | ||||
| 14 | H – 6 | -32 | 61W | ||||
| 15 | B – 4 | 12 | 11W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.