Daily Sunspot Evaluation
Observation Sheet Saturday, 15 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)
- 6
- Number of spots (f)
- 26
- Relative number (R)
- 86
- Observer
- ED
- Reading
- all checks consistent
- File
- 19720415.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | 8 | 16E | 28 | |||
| 2 | B – 4 | -6 | 38E | 6 | |||
| 3 | ? – 3 | -8 | 77E | 327 | |||
| 4 | A – 3 | -12 | 11W | 55 | |||
| 5 | A – 1 | -16 | 50W | 94 | |||
| 6 | C – 14 | -8 | 42W | 86 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.