Daily Sunspot Evaluation
Observation Sheet Thursday, 16 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)
- 8
- Number of spots (f)
- 38
- Relative number (R)
- 118
- Observer
- HM
- Reading
- all checks consistent
- File
- 19711216.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | G – 18 | 19 | 04E | 194 | |||
| 2 | J – 3 | 13 | 14E | 184 | |||
| 3 | C – 6 | 10 | 60E | 138 | |||
| 4 | J – 1 | -4 | 66E | 132 | |||
| 5 | J – 1 | -14 | 10E | 188 | |||
| 6 | B – 3 | -15 | 14W | 212 | |||
| 7 | J – 1 | -3 | 55W | 253 | |||
| 8 | C – 5 | 9 | 43W | 241 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.