Daily Sunspot Evaluation
Observation Sheet Monday, 9 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)
- 7
- Number of spots (f)
- 84
- Relative number (R)
- 154
- Observer
- HM
- Reading
- all checks consistent
- File
- 19730409.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | E – 47 | -9 | 23E | 323 | 62 | ||
| 2 | B – 3 | -11 | 10E | 336 | 63 | ||
| 3 | A – 5 | -15 | 05E | 341 | 64 | ||
| 4 | B – 8 | -12 | 05W | 351 | 58 | ||
| 5 | D – 16 | -9 | 12W | 358 | 61 | ||
| 6 | A – 1 | -3 | 03W | 349 | 65 | ||
| 7 | J – 4 | 12 | 54W | 40 | 54 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.