Daily Sunspot Evaluation
Observation Sheet Friday, 21 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)
- 31
- Relative number (R)
- 81
- Observer
- DK
- Reading
- counts consistent, some coordinates doubtful
- File
- 19670421.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | H – 2 | 24 | 26E | 293 | |||
| 2 | B – 8 | -14 | 44E | 275 | |||
| 3 | H – 5 | -23 | 27E | 282 ⚠ | |||
| 4 | C – 12 | -22 | 44W | 3 | |||
| 5 | H – 4 | 26 | 22W | 344 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.