Daily Sunspot Evaluation
Observation Sheet Sunday, 28 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)
- 4
- Number of spots (f)
- 29
- Relative number (R)
- 69
- Observer
- HM
- Reading
- all checks consistent
- File
- 19740728.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 3 | -16 | 28°E | 162 | |||
| 2 | A – 5 | -3 | 19°E | 176 | |||
| 3 | C – 17 | -8 | 15°W | 210 | |||
| 4 | G – 4 | -15 | 54°W | 219 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.