Daily Sunspot Evaluation
Observation Sheet Monday, 26 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)
- 4
- Number of spots (f)
- 54
- Relative number (R)
- 94
- Observer
- FA
- Reading
- all checks consistent
- File
- 19710426.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | D – 19 | 6 | 22E | 28 | |||
| 2 | G – 6 | -5 | 67E | 343 | |||
| 3 | G – 15 | -13 | 16E | 34 | |||
| 4 | D – 14 | -11 | 06E | 44 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.