Daily Sunspot Evaluation
Observation Sheet Saturday, 28 September 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)
- 3
- Number of spots (f)
- 6
- Relative number (R)
- 36
- Observer
- ED
- Reading
- all checks consistent
- File
- 19740928.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | 8 | 74E | 21 | |||
| 2 | J – 1 | -7 | 78E | 17 | |||
| 3 | A – 4 | 14 | 44W | 139 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.