Daily Sunspot Evaluation
Observation Sheet Monday, 20 January 1958
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)
- 18
- Number of spots (f)
- 78
- Relative number (R)
- 258
- Observer
- AB
- Reading
- all checks consistent
- File
- 19580120.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | H – 2 | 21 | 5E | ||||
| 2 | C – 3 | 38 | 8E | ||||
| 3 | B – 7 | 31 | 12E | ||||
| 4 | B – 6 | 24 | 18E | ||||
| 5 | D – 15 | 26 | 31E | ||||
| 6 | C – 6 | 28 | 50E | ||||
| 7 | J – 1 | 20 | 35E | ||||
| 8 | A – 2 | 5 | 20E | ||||
| 9 | ? – 1 | -9 | 85E | ||||
| 10 | C – 6 | -12 | 33E | ||||
| 11 | J – 1 | -20 | 41E | ||||
| 12 | A – 2 | -16 | 2E | ||||
| 13 | B – 3 | -24 | 8W | ||||
| 14 | J – 2 | -23 | 65W | ||||
| 15 | C – 7 | -7 | 50W | ||||
| 16 | G – 8 | 10 | 42W | ||||
| 17 | J – 3 | 14 | 31W | ||||
| 18 | J – 3 | 28 | 67W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.