Daily Sunspot Evaluation
Observation Sheet Thursday, 17 April 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)
- 9
- Number of spots (f)
- 88
- Relative number (R)
- 178
- Observer
- SM
- Reading
- all checks consistent
- File
- 19690417.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 17 | 20 | 0 | 85 | |||
| 2 | H – 6 | 22 | 25E | 60 | |||
| 3 | J – 3 | -15 | 23E | 62 | |||
| 4 | A – 1 | -21 | 25E | 60 | |||
| 5 | C – 7 | -14 | 04W | 89 | |||
| 6 | B – 5 | -14 | 39W | 124 | |||
| 7 | D – 20 | -7 | 27W | 112 | |||
| 8 | A – 2 | 16 | 20W | 105 | |||
| 9 | D – 27 | 9 | 04W | 89 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.