Daily Sunspot Evaluation
Observation Sheet Tuesday, 28 February 1967
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)
- 10
- Number of spots (f)
- 93
- Relative number (R)
- 193
- Observer
- SK
- Reading
- all checks consistent
- File
- 19670228.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | D – 11 | 17 | 21E | 263 | |||
| 2 | ? – 2 | 13 | 77E | 207 | |||
| 3 | J – 1 | -15 | 70E | 214 | |||
| 4 | C – 7 | -15 | 19E | 265 | |||
| 5 | H – 7 | -21 | 66E | 218 | |||
| 6 | A – 1 | -24 | 37E | 247 | |||
| 7 | C – 9 | -19 | 10E | 274 | |||
| 8 | J – 2 | -22 | 25W | 309 | |||
| 9 | A – 1 | 10 | 45W | 329 | |||
| 10 | F – 52 | 20 | 13W | 297 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.