Daily Sunspot Evaluation
Observation Sheet Tuesday, 27 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)
- 48
- Relative number (R)
- 88
- Observer
- FA
- Reading
- all checks consistent
- File
- 19710427.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | D – 16 | 7 | 08E | 29 | |||
| 2 | D – 8 | -5 | 54E | 343 | |||
| 3 | D – 10 | -13 | 03E | 34 | |||
| 4 | C – 14 | -11 | 07W | 44 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.