Daily Sunspot Evaluation
Observation Sheet Friday, 21 July 1967
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)
- 8
- Number of spots (f)
- 57
- Relative number (R)
- 137
- Observer
- LT
- Reading
- all checks consistent
- File
- 19670721.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 1 | 16 | 11E | 185 | |||
| 2 | A – 3 | 20 | 16E | 180 | |||
| 3 | ? – 1 | 25 | 90E | 106 | |||
| 4 | C – 6 | -8 | 43E | 153 | |||
| 5 | C – 12 | -23 | 36E | 160 | |||
| 6 | B – 6 | -21 | 38E | 158 | |||
| 7 | C – 19 | -30 | 19E | 177 | |||
| 8 | D – 9 | -17 | 54W | 250 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.