Daily Sunspot Evaluation
Observation Sheet Tuesday, 13 August 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)
- 10
- Number of spots (f)
- 69
- Relative number (R)
- 169
- Observer
- LT
- Reading
- all checks consistent
- File
- 19680813.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | D – 6 | 17 | 0 | 100 | |||
| 2 | ? – 1 | 7 | 86E | 14 | |||
| 3 | ? – 1 | -12 | 83E | 17 | |||
| 4 | E – 7 | -16 | 63E | 37 | |||
| 5 | J – 3 | -17 | 42E | 58 | |||
| 6 | A – 3 | -13 | 07W | 107 | |||
| 7 | B – 6 | -25 | 43W | 143 | |||
| 8 | D – 17 | -1 | 38W | 138 | |||
| 9 | H – 21 | 13 | 59W | 159 | |||
| 10 | A – 4 | 10 | 36W | 136 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.