Daily Sunspot Evaluation
Observation Sheet Tuesday, 20 February 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)
- 7
- Number of spots (f)
- 18
- Relative number (R)
- 88
- Observer
- SM
- Reading
- counts consistent, some coordinates doubtful
- File
- 19680220.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 1 | 2 | 17E | 235 | |||
| 2 | ? – 2 | 10 | 88E | 164 | |||
| 3 | A – 1 | -10 | 27E | 225 | |||
| 4 | A – 1 | -18 | 6E | 191 ⚠ | |||
| 5 | J – 5 | -30 | 41E | 211 | |||
| 6 | B – 3 | -17 | 44W | 296 | |||
| 7 | B – 5 | 27 | 28W | 280 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.