Daily Sunspot Evaluation
Observation Sheet Tuesday, 21 July 1959
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)
- 8
- Number of spots (f)
- 29
- Relative number (R)
- 109
- Observer
- BG
- Reading
- all checks consistent
- File
- 19590721.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 5 | 29 | 2E | ||||
| 2 | J – 2 | 23 | 40E | ||||
| 3 | J – 1 | 19 | 44E | ||||
| 4 | J – 1 | 9 | 0 | ||||
| 5 | J – 1 | 10 | 55W | ||||
| 6 | H – 8 | 12 | 21W | ||||
| 7 | G – 3 | 26 | 29W | ||||
| 8 | H – 8 | 31 | 23W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.