Daily Sunspot Evaluation
Observation Sheet Wednesday, 1 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)
- 12
- Relative number (R)
- 52
- Observer
- —
- Reading
- all checks consistent
- File
- 19530401.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | J – 2 | 0.68 | 28 | |
| 2 | C – 5 | 0.83 | 60 | |
| 3 | J – 1 | 0.53 | 70 | |
| 4 | B – 4 | 0.74 | 268 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.