Daily Sunspot Evaluation
Observation Sheet Sunday, 20 July 1975
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)
- 7
- Relative number (R)
- 37
- Observer
- GA
- Reading
- all checks consistent
- File
- 19750720.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | G – 4 | -7 | 04W | 167 | 07W | ||
| 2 | J – 2 | -10 | 53W | 216 | 56W | ||
| 3 | A – 1 | -3 | 41W | 204 | 44W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.