Daily Sunspot Evaluation
Observation Sheet Friday, 13 April 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)
- 2
- Number of spots (f)
- 42
- Relative number (R)
- 62
- Observer
- HM
- Reading
- all checks consistent
- File
- 19730413.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | E – 41 | -8 | 32W | 325 | 62 | ||
| 2 | A – 1 | -10 | 64W | 357 | 61 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.