Daily Sunspot Evaluation
Observation Sheet Friday, 31 December 1971
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)
- 32
- Relative number (R)
- 82
- Observer
- FA
- Reading
- all checks consistent
- File
- 19711231.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 4 | 22 | 29E | 331 | |||
| 2 | J – 4 | -4 | 31E | 329 | |||
| 3 | B – 3 | -17 | 57E | 303 | |||
| 4 | D – 16 | -8 | 01E | 359 | |||
| 5 | C – 5 | -14 | 58W | 58 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.