Daily Sunspot Evaluation
Observation Sheet Friday, 28 July 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)
- 77
- Relative number (R)
- 147
- Observer
- SK
- Reading
- all checks consistent
- File
- 19720728.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | D – 5 | -18 | 51E | 57 | |||
| 2 | B – 5 | -14 | 38E | 70 | |||
| 3 | A – 1 | -4 | 15E | 93 | |||
| 4 | E – 30 | -14 | 21E | 87 | |||
| 5 | B – 5 | -3 | 04E | 104 | |||
| 6 | ? – 2 | 5 | 10W | 118 | |||
| 7 | E – 29 | 8 | 29W | 137 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.