Daily Sunspot Evaluation
Observation Sheet Saturday, 20 December 1980
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)
- 13
- Number of spots (f)
- 78
- Relative number (R)
- 208
- Observer
- OG
- Reading
- all checks consistent
- File
- 19801220.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DKC – 12 | 7 | 34W | 342 | 36W | 9.5 | |
| 2 | BXI – 13 | 15 | 20W | 328 | 22W | 5 | |
| 3 | HKX – 3 | 6 | 14W | 322 | 16W | 7.75 | |
| 4 | ARK – 1 | 9 | 05W | 313 | 07W | ||
| 5 | ARK – 1 | 9 | 28E | 280 | 26E | ||
| 6 | DAC – 12 | 4 | 30E | 278 | 28E | 8 | |
| 7 | BXI – 4 | 3 | 42E | 266 | 40E | 1.5 | |
| 8 | HKX – 1 | 18 | 67E | 241 | 65E | 4.5 | |
| 9 | HAX – 2 | -19 | 41W | 349 | 43W | 1.5 | |
| 10 | CKO – 5 | -10 | 22W | 330 | 24W | 8 | |
| 11 | HKX – 2 | -16 | 15E | 293 | 13E | 3 | |
| 12 | CAI – 10 | -17 | 34E | 274 | 32E | 4 | |
| 13 | DKC – 12 | -6 | 43E | 265 | 41E | 7 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.