Daily Sunspot Evaluation
Observation Sheet Friday, 21 July 1961
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)
- 5
- Number of spots (f)
- 25
- Relative number (R)
- 75
- Observer
- MH
- Reading
- all checks consistent
- File
- 19610721.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | E – 9 | 8 | 50E | ||||
| 2 | B – 8 | 1 | 25E | ||||
| 3 | C – 6 | -7 | 9W | ||||
| 4 | A – 1 | -7 | 22W | ||||
| 5 | J – 1 | 11 | 64W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.