Daily Sunspot Evaluation
Observation Sheet Saturday, 21 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)
- 8
- Number of spots (f)
- 66
- Relative number (R)
- 146
- Observer
- HE
- Reading
- all checks consistent
- File
- 19900721.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | AR – 3 | 12 | 20W | 212 | 22W | 2 | 305 |
| 2 | AX – 3 | 22 | 15W | 207 | 17W | 1 | 312 |
| 3 | BRO – 3 | 10 | 16E | 176 | 14E | 3 | 313 |
| 4 | BRO – 5 | 22 | 22E | 170 | 20E | 4.5 | 314 |
| 5 | FKI – 26 | 10 | 51E | 141 | 49E | 18 | 311 |
| 6 | AX – 1 | -16 | 09W | 201 | 11W | - | 315 |
| 7 | FKO – 24 | -28 | 25E | 167 | 23E | 19.5 | 310 |
| 8 | HA – 1 | -22 | 70E | 122 | 68E | 2 | 316 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.