Daily Sunspot Evaluation
Observation Sheet Thursday, 21 July 1960
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)
- 11
- Number of spots (f)
- 72
- Relative number (R)
- 182
- Observer
- FY
- Reading
- all checks consistent
- File
- 19600721.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | H – 10 | 24 | 20E | ||||
| 2 | J – 5 | 9 | 34E | ||||
| 3 | A – 1 | 10 | 43E | ||||
| 4 | A – 4 | -6 | 57E | ||||
| 5 | J – 1 | -8 | 68E | ||||
| 6 | ? – 1 | -10 | 78E | ||||
| 7 | J – 2 | -11 | 34E | ||||
| 8 | J – 1 | -17 | 37W | ||||
| 9 | D – 9 | -9 | 25W | ||||
| 10 | F – 37 | 21 | 61W | ||||
| 11 | A – 1 | 44 | 20W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.