Daily Sunspot Evaluation
Observation Sheet Thursday, 18 February 1960
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)
- 5
- Number of spots (f)
- 30
- Relative number (R)
- 80
- Observer
- SG
- Reading
- all checks consistent
- File
- 19600218.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 1 | -21 | 85E | ||||
| 2 | E – 25 | 12 | 42W | ||||
| 3 | ? – 2 | 22 | 78W | ||||
| 4 | A – 1 | 18 | 36W | ||||
| 5 | A – 1 | 18 | 27W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.