Daily Sunspot Evaluation
Observation Sheet Monday, 23 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)
- 5
- Number of spots (f)
- 62
- Relative number (R)
- 112
- Observer
- HM
- Reading
- counts consistent, some coordinates doubtful
- File
- 19730423.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | E – 38 | 12 | 12E | 143 ⚠ | 68 | ||
| 2 | A – 1 | -1 | 80E | 81 | 71 | ||
| 3 | H – 9 | -6 | 73E | 88 | 70 | ||
| 4 | A – 1 | -11 | 78E | 83 | 72 | ||
| 5 | C – 13 | -16 | 24W | 185 | 69 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.