Daily Sunspot Evaluation
Observation Sheet Friday, 17 December 2004
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)
- 18
- Relative number (R)
- 58
- Observer
- —
- Reading
- all checks consistent
- File
- 20041217.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DRI – 5 | -7 | 67W | 274 | 76W | 6 | 216 |
| 2 | CRO – 6 | -9 | 58W | 265 | 61W | 4.5 | 217 |
| 3 | DRO – 5 | -10 | 60E | 147 | 57E | 3.5 | 218 |
| 4 | ? – 2 | -9 | 80E | 127 | 77E | ~2 | 219 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.