Daily Sunspot Evaluation
Observation Sheet Tuesday, 20 April 2004
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)
- 4
- Number of spots (f)
- 27
- Relative number (R)
- 67
- Observer
- TG
- Reading
- all checks consistent
- File
- 20040420.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HR – 2 | -6 | 50W | 200 | 52W | ~2.5 | 65 |
| 2 | DRO – 4 | -19 | 29W | 179 | 31W | ~7.5 | 66 |
| 3 | CSO – 10 | -6 | 22E | 128 | 20E | ~7.5 | 67 |
| 4 | EAO – 11 | -9 | 39E | 111 | 37E | ~11 | 68 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.