Daily Sunspot Evaluation
Observation Sheet Tuesday, 12 September 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)
- 4
- Number of spots (f)
- 15
- Relative number (R)
- 55
- Observer
- ED
- Reading
- all checks consistent
- File
- 19720912.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | C – 4 | -10 | 64E | 157 | |||
| 2 | D – 8 | -12 | 37E | 184 | |||
| 3 | A – 1 | -19 | 18W | 239 | |||
| 4 | H – 2 | 20 | 21W | 242 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.