Daily Sunspot Evaluation
Observation Sheet Sunday, 21 July 1968
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)
- 49
- Relative number (R)
- 129
- Observer
- AT
- Reading
- all checks consistent
- File
- 19680721.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 2 | 18 | 34E | 11 | |||
| 2 | B – 6 | 17 | 44E | 1 | |||
| 3 | D – 11 | 8 | 35E | 10 | |||
| 4 | D – 15 | -19 | 35E | 10 | |||
| 5 | H – 1 | -17 | 7E | 38 | |||
| 6 | A – 2 | -16 | 6W | 51 | |||
| 7 | J – 1 | -15 | 65W | 112 | |||
| 8 | H – 11 | 12 | 49W | 94 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.