Daily Sunspot Evaluation
Observation Sheet Friday, 17 October 1969
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)
- 3
- Number of spots (f)
- 10
- Relative number (R)
- 40
- Observer
- AT
- Reading
- all checks consistent
- File
- 19691017.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 3 | -31 | 09W | 194 | |||
| 2 | C – 6 | -4 | 55W | 240 | |||
| 3 | H – 1 | 41 | 71W | 256 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.