Daily Sunspot Evaluation
Observation Sheet Tuesday, 7 April 1953
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)
- 4
- Number of spots (f)
- 18
- Relative number (R)
- 58
- Observer
- ET
- Reading
- all checks consistent
- File
- 19530407.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | A – 1 | 0.79 | 239 | |
| 2 | J – 1 | 0.57 | 255 | |
| 3 | B – 8 | 0.69 | 257 | |
| 4 | C – 8 | 0.49 | 263 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.