Daily Sunspot Evaluation
Observation Sheet Tuesday, 17 July 1956
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)
- 28
- Relative number (R)
- 108
- Observer
- MH
- Reading
- all checks consistent
- File
- 19560717.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | C – 7 | 26 | 16E | ||||
| 2 | J – 1 | -21 | 63E | ||||
| 3 | J – 1 | -15 | 43E | ||||
| 4 | C – 4 | 15 | 68W | ||||
| 5 | A – 4 | 16 | 80W | ||||
| 6 | B – 6 | 19 | 48W | ||||
| 7 | B – 2 | 32 | 32W | ||||
| 8 | A – 3 | 16 | 7W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.