Daily Sunspot Evaluation
Observation Sheet Sunday, 11 July 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)
- 33
- Relative number (R)
- 63
- Observer
- LT
- Reading
- all checks consistent
- File
- 19710711.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | D – 8 | 15 | 68E | 57 | |||
| 2 | J – 5 | -11 | 32E | 93 | |||
| 3 | C – 20 | -8 | 00 | 125 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.