Daily Sunspot Evaluation
Observation Sheet Monday, 21 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)
- 10
- Number of spots (f)
- 53
- Relative number (R)
- 153
- Observer
- AT
- Reading
- all checks consistent
- File
- 19690421.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 3 | 19 | 10E | 22 | |||
| 2 | B – 4 | -20 | 29W | 61 | |||
| 3 | J – 1 | -15 | 29W | 61 | |||
| 4 | C – 16 | -15 | 60W | 92 | |||
| 5 | ? – 1 | -6 | 83W | 115 | |||
| 6 | A – 3 | 6 | 61W | 93 | |||
| 7 | J – 2 | 11 | 56W | 88 | |||
| 8 | C – 4 | 22 | 53W | 85 | |||
| 9 | H – 17 | 22 | 27W | 59 | |||
| 10 | A – 2 | 23 | 12W | 44 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.