Daily Sunspot Evaluation
Observation Sheet Friday, 20 July 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)
- 4
- Number of spots (f)
- 41
- Relative number (R)
- 81
- Observer
- YK
- Reading
- all checks consistent
- File
- 19900720.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | AX – 1 | 19 | 57W | 263 | 60W | 338 | |
| 2 | CAO – 7 | 12 | 05W | 211 | 08W | 4 | 335 |
| 3 | FAI – 15 | 10 | 62E | 144 | 59E | 17 | 331 |
| 4 | FKC – 18 | -28 | 39E | 167 | 36E | 14.5 | 330 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.