Daily Sunspot Evaluation
Observation Sheet Tuesday, 12 December 1972
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)
- 5
- Number of spots (f)
- 21
- Relative number (R)
- 71
- Observer
- ED
- Reading
- all checks consistent
- File
- 19721212.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 2 | 21 | 45E | 55 | |||
| 2 | D – 6 | -19 | 40E | 60 | |||
| 3 | B – 2 | -19 | 01E | 99 | |||
| 4 | J – 4 | 11 | 15W | 115 | |||
| 5 | E – 7 | 10 | 04W | 104 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.