Daily Sunspot Evaluation
Observation Sheet Thursday, 21 August 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)
- 5
- Number of spots (f)
- 14
- Relative number (R)
- 64
- Observer
- SM
- Reading
- all checks consistent
- File
- 19690821.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 3 | 41 | 86°E | 427 | |||
| 2 | J – 3 | -17 | 23E | 190 | |||
| 3 | A – 2 | -7 | 02E | 211 | |||
| 4 | B – 5 | -43 | 36W | 249 | |||
| 5 | A – 1 | 10 | 76W | 289 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.