Daily Sunspot Evaluation
Observation Sheet Friday, 17 April 1959
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)
- 9
- Number of spots (f)
- 80
- Relative number (R)
- 170
- Observer
- KA
- Reading
- all checks consistent
- File
- 19590417.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | H – 4 | 13 | 7E | ||||
| 2 | ? – 2 | 19 | 73E | ||||
| 3 | A – 1 | -12 | 57E | ||||
| 4 | D – 16 | -16 | 44W | ||||
| 5 | E – 17 | -10 | 25W | ||||
| 6 | D – 2 | 0 | 65W | ||||
| 7 | E – 29 | 26 | 31W | ||||
| 8 | B – 7 | -1 | 11W | ||||
| 9 | H – 2 | 18 | 2W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.