Daily Sunspot Evaluation
Observation Sheet Sunday, 21 September 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)
- 7
- Number of spots (f)
- 14
- Relative number (R)
- 84
- Observer
- AT
- Reading
- all checks consistent
- File
- 19690921.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 2 | 5 | 81E | 87 | |||
| 2 | B – 2 | 5 | 62E | 106 | |||
| 3 | A – 1 | -10 | 64E | 104 | |||
| 4 | A – 1 | -29 | 51E | 117 | |||
| 5 | D – 5 | -4 | 52W | 220 | |||
| 6 | A – 2 | -4 | 60W | 228 | |||
| 7 | J – 1 | 14 | 70W | 238 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.