Daily Sunspot Evaluation
Observation Sheet Thursday, 29 April 1971
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)
- 22
- Relative number (R)
- 52
- Observer
- HA
- Reading
- all checks consistent
- File
- 19710429.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | G – 9 | -4 | 26E | 345 | |||
| 2 | G – 4 | -12 | 32W | 43 | |||
| 3 | G – 9 | 7 | 19W | 30 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.