Daily Sunspot Evaluation
Observation Sheet Thursday, 20 April 1967
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)
- 5
- Number of spots (f)
- 13
- Relative number (R)
- 63
- Observer
- SK
- Reading
- counts consistent, some coordinates doubtful
- File
- 19670420.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | FF – 2 | 25 | 36E | 293 | |||
| 2 | A – 2 | -13 | 55E | 274 | |||
| 3 | FF – 3 | -22 | 35E | 294 | |||
| 4 | B – 4 | -21 | 34W | 295.03 ⚠ | |||
| 5 | H – 2 | 26 | 13W | 342 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.