Daily Sunspot Evaluation
Observation Sheet Wednesday, 28 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)
- 107
- Relative number (R)
- 177
- Observer
- LT
- Reading
- all checks consistent
- File
- 19680228.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | E – 23 | 13 | 24E | 123 | |||
| 2 | ? – 3 | -23 | 82E | 65 | |||
| 3 | C – 33 | -27 | 3W | 150 | |||
| 4 | A – 1 | -16 | 22W | 169 | |||
| 5 | A – 1 | 21 | 55W | 202 | |||
| 6 | E – 45 | 12 | 18W | 165 | |||
| 7 | A – 1 | 20 | 21W | 168 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.