Daily Sunspot Evaluation
Observation Sheet Saturday, 13 April 1974
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)
- 65
- Relative number (R)
- 95
- Observer
- SK
- Reading
- all checks consistent
- File
- 19740413.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 13 | -16 | 10W | 165 | |||
| 2 | E – 45 | -13 | 30W | 185 | |||
| 3 | B – 7 | -4 | 63W | 218 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.