Daily Sunspot Evaluation
Observation Sheet Thursday, 18 January 1968
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)
- 18
- Relative number (R)
- 58
- Observer
- SB
- Reading
- all checks consistent
- File
- 19680118.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 2 | 22 | 48E | 279 | |||
| 2 | A – 7 | -5 | 76E | 251 | |||
| 3 | C – 3 | 8 | 70W | 37 | |||
| 4 | H – 6 | 20 | 66W | 33 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.