Daily Sunspot Evaluation
Observation Sheet Wednesday, 12 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)
- 55
- Relative number (R)
- 125
- Observer
- FA
- Reading
- all checks consistent
- File
- 19720412.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | 9 | 57E | 27 | |||
| 2 | D – 12 | -11 | 32E | 52 | |||
| 3 | E – 25 | -7 | 01E | 83 | |||
| 4 | C – 12 | -15 | 07W | 91 | |||
| 5 | A – 1 | -12 | 44W | 128 | |||
| 6 | A – 1 | -9 | 35W | 119 | |||
| 7 | A – 3 | -9 | 45W | 129 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.