Daily Sunspot Evaluation
Observation Sheet Sunday, 17 April 1966
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)
- 3
- Number of spots (f)
- 20
- Relative number (R)
- 50
- Observer
- HıE
- Reading
- all checks consistent
- File
- 19660417.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 1 | 20 | 01E | 149 | |||
| 2 | B – 2 | 15 | 03E | 147 | |||
| 3 | D – 17 | 23 | 19E | 131 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.