Daily Sunspot Evaluation
Observation Sheet Tuesday, 18 December 1973
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)
- 14
- Relative number (R)
- 54
- Observer
- ED
- Reading
- counts consistent, some coordinates doubtful
- File
- 19731218.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | 8 | 43E | 193 ⚠ | 221 | ||
| 2 | C – 9 | -18 | 55E | 187 | 222 | ||
| 3 | A – 3 | -13 | 30E | 212 | 223 | ||
| 4 | A – 1 | 2 | 63W | 305 | 220 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.