Daily Sunspot Evaluation
Observation Sheet Sunday, 28 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)
- 78
- Relative number (R)
- 158
- Observer
- AT
- Reading
- all checks consistent
- File
- 19680728.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | H – 18 | 15 | 33E | 279 | |||
| 2 | C – 13 | 8 | 35E | 277 | |||
| 3 | E – 18 | -16 | 55W | 7 | |||
| 4 | J – 1 | -16 | 88W | 40 | |||
| 5 | D – 8 | 9 | 60W | 12 | |||
| 6 | D – 10 | 11 | 30W | 342 | |||
| 7 | A – 1 | 21 | 10W | 322 | |||
| 8 | B – 9 | 30 | 10W | 322 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.