Daily Sunspot Evaluation
Observation Sheet Monday, 16 December 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)
- 76
- Relative number (R)
- 206
- Observer
- FY
- Reading
- all checks consistent
- File
- 19571216.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 2 | 18 | 20E | ||||
| 2 | E – 22 | 19 | 51E | ||||
| 3 | D – 5 | 23 | 68E | ||||
| 4 | A – 2 | -7 | 44E | ||||
| 5 | B – 6 | -11 | 46E | ||||
| 6 | E – 15 | -15 | 37E | ||||
| 7 | B – 7 | -25 | 21E | ||||
| 8 | A – 1 | -20 | 1W | ||||
| 9 | B – 7 | -13 | 3W | ||||
| 10 | ? – 1 | -22 | 83W | ||||
| 11 | ? – 2 | 4 | 80W | ||||
| 12 | D – 3 | 11 | 69W | ||||
| 13 | C – 3 | 14 | 36W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.