Daily Sunspot Evaluation
Observation Sheet Monday, 21 June 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)
- 18
- Relative number (R)
- 48
- Observer
- MA
- Reading
- all checks consistent
- File
- 19710621.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | D – 6 | 11 | 45E | 342 | |||
| 2 | A – 7 | -19 | 36E | 351 | |||
| 3 | B – 5 | -12 | 55W | 82 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.