Daily Sunspot Evaluation
Observation Sheet Monday, 21 December 1970
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)
- 95
- Relative number (R)
- 165
- Observer
- HA
- Reading
- all checks consistent
- File
- 19701221.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 10 | 18 | 58°E | 212 | |||
| 2 | D – 22 | -10 | 47°E | 223 | |||
| 3 | A – 8 | -10 | 05°E | 265 | |||
| 4 | A – 3 | -11 | 35°W | 305 | |||
| 5 | D – 25 | 13 | 12°W | 282 | |||
| 6 | G – 4 | 18 | 19°W | 289 | |||
| 7 | E – 23 | 24 | 23°W | 293 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.