Daily Sunspot Evaluation
Observation Sheet Saturday, 16 January 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)
- 4
- Number of spots (f)
- 25
- Relative number (R)
- 65
- Observer
- MA
- Reading
- all checks consistent
- File
- 19710116.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | E – 9 | 20 | 65E | 223 | |||
| 2 | ? – 4 | 0 | 83W | 11 | |||
| 3 | B – 11 | 10 | 36W | 324 | |||
| 4 | J – 1 | 19 | 12W | 300 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.