Daily Sunspot Evaluation
Observation Sheet Friday, 20 October 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)
- 35
- Relative number (R)
- 65
- Observer
- FA
- Reading
- all checks consistent
- File
- 19721020.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 5 | -17 | 57E | 22 | |||
| 2 | D – 12 | -7 | 13E | 66 | |||
| 3 | C – 18 | -16 | 27E | 52 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.