Daily Sunspot Evaluation
Observation Sheet Sunday, 20 July 1969
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)
- 4
- Number of spots (f)
- 24
- Relative number (R)
- 64
- Observer
- AT
- Reading
- all checks consistent
- File
- 19690720.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | G – 17 | 42 | 44°E | 237 | |||
| 2 | A – 1 | 6 | 55W | 336 | |||
| 3 | J – 1 | 44 | 52W | 333 | |||
| 4 | C – 5 | 25 | 28W | 309 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.