Daily Sunspot Evaluation
Observation Sheet Saturday, 12 February 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)
- 27
- Relative number (R)
- 67
- Observer
- ED
- Reading
- all checks consistent
- File
- 19720212.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | H – 12 | 18 | 31E | 123 | |||
| 2 | J – 1 | 25 | 60E | 94 | |||
| 3 | C – 9 | -3 | 11E | 143 | |||
| 4 | H – 5 | -16 | 59E | 95 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.