Daily Sunspot Evaluation
Observation Sheet Friday, 27 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)
- 9
- Number of spots (f)
- 67
- Relative number (R)
- 157
- Observer
- YK
- Reading
- all checks consistent
- File
- 19900427.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DAI – 15 | 16 | 29W | 266 | 31W | 8.5 | 175 |
| 2 | BRI – 16 | 23 | 08W | 245 | 10W | 4 | 176 |
| 3 | HA – 5 | 12 | 23E | 214 | 21E | 2 | 179 |
| 4 | HA – 1 | 22 | 77E | 160 | 75E | 2 | 183 |
| 5 | HA – 1 | -20 | 74W | 311 | 76W | 1.5 | 170 |
| 6 | BXI – 16 | -20 | 24W | 261 | 26W | 4 | 182 |
| 7 | AX – 1 | -9 | 17W | 254 | 19W | - | 174 |
| 8 | BXO – 8 | -19 | 10W | 247 | 12W | 5 | 184 |
| 9 | EAO – 4 | -5 | 24E | 213 | 22E | 10.5 | 180 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.