Daily Sunspot Evaluation
Observation Sheet Thursday, 4 December 1969
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)
- 10
- Number of spots (f)
- 42
- Relative number (R)
- 142
- Observer
- TY
- Reading
- all checks consistent
- File
- 19691204.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 1 | 15 | 34E | 238 | |||
| 2 | J – 1 | 17 | 50E | 222 | |||
| 3 | B – 6 | -10 | 14E | 258 | |||
| 4 | G – 7 | -21 | 06E | 266 | |||
| 5 | A – 5 | -19 | 14W | 286 | |||
| 6 | A – 9 | -17 | 31W | 303 | |||
| 7 | H – 1 | -15 | 50W | 322 | |||
| 8 | A – 2 | -2 | 72W | 344 | |||
| 9 | D – 9 | 21 | 48W | 320 | |||
| 10 | A – 1 | 20 | 29W | 301 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.