Daily Sunspot Evaluation
Observation Sheet Thursday, 21 December 1989
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)
- 8
- Number of spots (f)
- 57
- Relative number (R)
- 137
- Observer
- TÖ0
- Reading
- all checks consistent
- File
- 19891221.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | CHO – 3 | 13 | 29W | 140 | 32W | 11.5 | |
| 2 | DKI – 21 | 20 | 17W | 128 | 20W | 5.5 | |
| 3 | BRO – 6 | 18 | 18E | 93 | 15E | 5 | |
| 4 | HS – 1 | 26 | 54E | 57 | 51E | 2 | |
| 5 | ? – 3 | -10 | 80W | 191 | 83W | 5 | |
| 6 | BXO – 4 | -29 | 03E | 108 | 00 | 2.5 | |
| 7 | HK – 7 | -5 | 07E | 104 | 04E | 3 | |
| 8 | EAI – 12 | -10 | 62E | 49 | 59E | 12 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.