Daily Sunspot Evaluation
Observation Sheet Saturday, 21 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)
- 7
- Relative number (R)
- 37
- Observer
- ED
- Reading
- all checks consistent
- File
- 19741221.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 2 | 5 | 32E | 35 | 30E | ||
| 2 | H – 2 | 13 | 39W | 106 | 41W | ||
| 3 | B – 3 | 6 | 07W | 74 | 03W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.