Daily Sunspot Evaluation
Observation Sheet Thursday, 16 May 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)
- 12
- Number of spots (f)
- 80
- Relative number (R)
- 200
- Observer
- FY
- Reading
- all checks consistent
- File
- 19570516.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | B – 2 | 43 | ||
| 2 | D – 8 | 58 | ||
| 3 | C – 3 | 29 | ||
| 4 | B – 14 | 47 | ||
| 5 | B – 3 | 11 | ||
| 6 | E – 17 | 7 | ||
| 7 | A – 1 | 10 | ||
| 8 | C – 10 | 70 | ||
| 9 | C – 10 | 53 | ||
| 10 | C – 10 | 69 | ||
| 11 | J – 1 | 11 | ||
| 12 | J – 1 | 2 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.