Daily Sunspot Evaluation
Observation Sheet Sunday, 20 April 1980
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)
- 11
- Number of spots (f)
- 90
- Relative number (R)
- 200
- Observer
- TÖ
- Reading
- all checks consistent
- File
- 19800420.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DAI – 9 | 12 | 50W | 341 | 52W | 8 | |
| 2 | AXX – 1 | 8 | 10W | 301 | 12W | - | |
| 3 | CAI – 7 | 23 | 53E | 238 | 51E | 7 | |
| 4 | CSI – 2 | 10 | 61E | 230 | 57E | 1.5 | |
| 5 | AXX – 4 | 15 | 70E | 221 | 68E | 3 | |
| 6 | DAO – 3 | -31 | 75W | 6 | 77W | 7 | |
| 7 | AXX – 2 | -16 | 70W | 1 | 72W | 2.5 | |
| 8 | DAO – 10 | -28 | 46W | 337 | 48W | 7.5 | |
| 9 | ESI – 26 | -17 | 26E | 265 | 24E | 12 | |
| 10 | AXX – 1 | -26 | 35E | 256 | 33E | - | |
| 11 | ESI – 25 | -12 | 53E | 238 | 51E | 14 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.