Daily Sunspot Evaluation
Observation Sheet Tuesday, 9 April 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)
- 5
- Number of spots (f)
- 41
- Relative number (R)
- 91
- Observer
- HM
- Reading
- all checks consistent
- File
- 19740409.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | C – 25 | -13 | 26E | 183 | |||
| 2 | A – 6 | -16 | 46E | 163 | |||
| 3 | C – 5 | -5 | 05W | 214 | |||
| 4 | B – 3 | 11 | 54W | 263 | |||
| 5 | A – 2 | 14 | 49W | 258 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.