Daily Sunspot Evaluation
Observation Sheet Sunday, 17 December 1967
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)
- 13
- Number of spots (f)
- 150
- Relative number (R)
- 280
- Observer
- LT
- Reading
- all checks consistent
- File
- 19671217.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | F – 78 | 19 | 0 | 28 | |||
| 2 | H – 9 | 24 | 54E | 334 | |||
| 3 | ? – 2 | -26 | 75E | 313 | |||
| 4 | A – 1 | -22 | 13W | 41 | |||
| 5 | H – 7 | -33 | 63W | 91 | |||
| 6 | B – 5 | -21 | 31W | 59 | |||
| 7 | ? – 1 | -28 | 76W | 104 | |||
| 8 | J – 3 | -20 | 66W | 94 | |||
| 9 | A – 2 | 9 | 60W | 88 | |||
| 10 | B – 4 | 20 | 45W | 73 | |||
| 11 | D – 14 | 25 | 40W | 68 | |||
| 12 | J – 2 | 9 | 12W | 40 | |||
| 13 | D – 22 | 20 | 10W | 38 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.