Daily Sunspot Evaluation
Observation Sheet Saturday, 13 August 1955
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)
- 5
- Number of spots (f)
- 37
- Relative number (R)
- 87
- Observer
- ET
- Reading
- all checks consistent
- File
- 19550813.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | C – 10 | 0.37 | 56 | |
| 2 | A – 4 | 0.58 | 181 | |
| 3 | E – 18 | 0.66 | 240 | |
| 4 | H – 2 | 0.62 | 302 | |
| 5 | B – 3 | 0.83 | 320 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.