Daily Sunspot Evaluation
Observation Sheet Saturday, 18 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)
- 6
- Number of spots (f)
- 50
- Relative number (R)
- 110
- Observer
- SG
- Reading
- all checks consistent
- File
- 19590418.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 5 | 19 | 61 | ||||
| 2 | C – 9 | -16 | 58 | ||||
| 3 | C – 12 | -9 | 39 | ||||
| 4 | E – 15 | 27 | 50 | ||||
| 5 | H – 3 | 18 | 16 | ||||
| 6 | H – 6 | 14 | 6 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.