Daily Sunspot Evaluation
Observation Sheet Wednesday, 20 March 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)
- 8
- Number of spots (f)
- 52
- Relative number (R)
- 132
- Observer
- FY
- Reading
- all checks consistent
- File
- 19570320.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | J – 2 | 33 | 29 | |
| 2 | ? – 4 | -12 | 80 | |
| 3 | D – 15 | -16 | 46 | |
| 4 | D – 17 | -24 | 13 | |
| 5 | A – 1 | -37 | 54 | |
| 6 | D – 9 | -21 | 55 | |
| 7 | A – 1 | 10 | 38 | |
| 8 | A – 3 | 12 | 30 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.