Daily Sunspot Evaluation
Observation Sheet Thursday, 21 June 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)
- 5
- Number of spots (f)
- 19
- Relative number (R)
- 69
- Observer
- HÇ0
- Reading
- all checks consistent
- File
- 19900621.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DAO – 8 | 9 | 51W | 281 | 54W | 7.5 | 252 |
| 2 | ? – 1 | 26 | 80E | 150 | 77E | - | 262 |
| 3 | ? – 1 | -14 | 85W | 315 | 88W | 5 | 241 |
| 4 | EAO – 8 | -30 | 52W | 282 | 55W | 15 | 250 |
| 5 | HA – 1 | -9 | 29W | 259 | 32W | 2 | 253 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.