Daily Sunspot Evaluation
Observation Sheet Saturday, 28 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)
- 4
- Number of spots (f)
- 37
- Relative number (R)
- 77
- Observer
- ED
- Reading
- all checks consistent
- File
- 19730428.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | C – 4 | -1 | 09E | 86 | 73 | ||
| 2 | H – 15 | -6 | 05E | 90 | 70 | ||
| 3 | C – 5 | -6 | 02W | 97 | 74 | ||
| 4 | H – 13 | 12 | 51W | 146 | 62 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.