Daily Sunspot Evaluation
Observation Sheet Wednesday, 18 July 1973
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)
- 16
- Relative number (R)
- 56
- Observer
- ED
- Reading
- all checks consistent
- File
- 19730718.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 3 | 18 | 46°E | 58 | 136 | ||
| 2 | B – 7 | -5 | 06°W | 110 | 134 | ||
| 3 | A – 3 | -11 | 44°W | 148 | 135 | ||
| 4 | A – 3 | 14 | 48°W | 152 | 137 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.