Daily Sunspot Evaluation
Observation Sheet Tuesday, 4 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)
- 3
- Number of spots (f)
- 19
- Relative number (R)
- 49
- Observer
- HM
- Reading
- all checks consistent
- File
- 19720404.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | -9 | 65E | 125 | |||
| 2 | H – 12 | -9 | 06W | 196 | |||
| 3 | B – 6 | 1 | 17W | 207 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.