Daily Sunspot Evaluation
Observation Sheet Tuesday, 21 February 1978
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)
- 27
- Relative number (R)
- 77
- Observer
- GA
- Reading
- all checks consistent
- File
- 19780221.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | D – 8 | 20 | 03E | 260 | 02E | ||
| 2 | ? – 2 | 41 | 65E | 198 | 64E | ||
| 3 | D – 11 | 23 | 39E | 224 | 38E | ||
| 4 | ? – 1 | -19 | 75E | 188 | 74E | ||
| 5 | G – 5 | 30 | 21W | 284 | 22W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.