Daily Sunspot Evaluation
Observation Sheet Sunday, 23 April 1972
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)
- 53
- Relative number (R)
- 123
- Observer
- HM
- Reading
- all checks consistent
- File
- 19720423.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 2 | 18 | 47E | 252 | |||
| 2 | A – 1 | 4 | 65E | 234 | |||
| 3 | J – 1 | -6 | 48E | 251 | |||
| 4 | D – 21 | -14 | 29E | 272 | |||
| 5 | H – 15 | -10 | 20W | 319 | |||
| 6 | C – 8 | -3 | 22W | 321 | |||
| 7 | B – 5 | 14 | 39W | 338 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.