Daily Sunspot Evaluation
Observation Sheet Saturday, 15 December 1990
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)
- 94
- Relative number (R)
- 134
- Observer
- HE
- Reading
- all checks consistent
- File
- 19901215.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HA – 2 | 28 | 01W | 52 | 03W | 1 | 585 |
| 2 | EKO – 35 | 5 | 03E | 48 | 01E | 14 | 590 |
| 3 | HA – 5 | 22 | 20E | 31 | 18E | 1.5 | 593 |
| 4 | FKC – 52 | 17 | 32E | 19 | 30E | 18 | 595 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.