Daily Sunspot Evaluation
Observation Sheet Tuesday, 20 April 1999
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)
- 5
- Number of spots (f)
- 28
- Relative number (R)
- 78
- Observer
- TA
- Reading
- all checks consistent
- File
- 19990420.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DAO – 4 | 21 | 68W | 214 | 71W | 09 | |
| 2 | AX – 1 | 23 | 12W | 158 | 15W | ||
| 3 | AX – 4 | 20 | 09E | 137 | 06E | 11 | |
| 4 | CAO – 5 | -21 | 01W | 147 | 04W | 8.5 | |
| 5 | DAC – 14 | -15 | 38E | 108 | 35E | 7 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.