Daily Sunspot Evaluation
Observation Sheet Monday, 30 April 1990
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)
- 8
- Number of spots (f)
- 25
- Relative number (R)
- 105
- Observer
- TÖ0
- Reading
- all checks consistent
- File
- 19900430.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | BRO – 2 | 16 | 74W | 268 | 73W | 10 | 175 |
| 2 | BXI – 3 | 26 | 52W | 246 | 51W | 4.5 | 176 |
| 3 | CAI – 7 | 13 | 18W | 212 | 17W | 7.5 | 179 |
| 4 | HA – 1 | 20 | 32E | 162 | 33E | 2.5 | 183 |
| 5 | BAI – 7 | -22 | 66W | 260 | 65W | 10 | 182 |
| 6 | BAO – 2 | -18 | 55W | 249 | 54W | 4.5 | 184 |
| 7 | CAO – 2 | -5 | 19W | 212 | 18W | 10 | 180 |
| 8 | ? – 1 | -14 | 85E | 109 | 86E | - | 185 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.