Daily Sunspot Evaluation
Observation Sheet Friday, 13 April 1956
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
- 19560413.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | D – 9 | 0.61 | 32 | |
| 2 | A – 1 | 0.82 | 36 | |
| 3 | C – 5 | 0.86 | 36 | |
| 4 | A – 1 | 0.93 | 86 | |
| 5 | A – 24 | 0.56 | 91 | |
| 6 | J – 1 | 0.91 | 100 | |
| 7 | E – 16 | 0.74 | 101 | |
| 8 | H – 1 | 0.31 | 118 | |
| 9 | A – 1 | 0.91 | 288 | |
| 10 | H – 6 | 0.68 | 288 | |
| 11 | B – 7 | 0.6 | 302 | |
| 12 | A – 3 | 0.62 | 348 | |
| 13 | J – 1 | 0.49 | 358 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.