Daily Sunspot Evaluation
Observation Sheet Wednesday, 21 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)
- 6
- Number of spots (f)
- 21
- Relative number (R)
- 81
- Observer
- SB
- Reading
- counts consistent, some coordinates doubtful
- File
- 19680221.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 1 | 3 | 05E | 235 | |||
| 2 | ? – 4 | 13 | 75E | 165 | |||
| 3 | A – 1 | -16 | 54E | 186 | |||
| 4 | C – 7 | -29 | 32E | 208 | |||
| 5 | B – 5 | -17 | 55W | 295 | |||
| 6 | C – 3 | 27 | 39W | 299 ⚠ |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.