Daily Sunspot Evaluation
Observation Sheet Friday, 20 December 1974
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)
- 3
- Number of spots (f)
- 9
- Relative number (R)
- 39
- Observer
- FA
- Reading
- all checks consistent
- File
- 19741220.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 2 | 6 | 04E | 76 | 04E | ||
| 2 | J – 5 | 5 | 47E | 33 | 44E | ||
| 3 | H – 2 | 13 | 24W | 104 | 27W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.