Daily Sunspot Evaluation
Observation Sheet Thursday, 18 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)
- 4
- Number of spots (f)
- 28
- Relative number (R)
- 68
- Observer
- HM
- Reading
- all checks consistent
- File
- 19740418.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 2 | -8 | 34E | 56 | |||
| 2 | D – 15 | -12 | 34W | 124 | |||
| 3 | D – 8 | -13 | 75W | 165 | |||
| 4 | A – 3 | -8 | 29W | 119 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.