Daily Sunspot Evaluation
Observation Sheet Friday, 12 April 1963
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)
- 41
- Relative number (R)
- 81
- Observer
- FY
- Reading
- all checks consistent
- File
- 19630412.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | D – 21 | -10 | 32E | ||||
| 2 | C – 2 | -19 | 30E | ||||
| 3 | A – 2 | -8 | 31W | ||||
| 4 | C – 16 | 14 | 60W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.