Daily Sunspot Evaluation
Observation Sheet Sunday, 21 July 1974
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
- HM
- Reading
- all checks consistent
- File
- 19740721.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 1 | -11 | 77°E | 210 | |||
| 2 | A – 5 | -14 | 42°E | 245 | |||
| 3 | G – 4 | -15 | 08°W | 295 | |||
| 4 | A – 1 | -9 | 09°W | 295 | |||
| 5 | C – 5 | -11 | 54°W | 341 | |||
| 6 | B – 5 | -4 | 57°W | 344 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.