Daily Sunspot Evaluation
Observation Sheet Tuesday, 15 April 1980
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)
- 216
- Relative number (R)
- 306
- Observer
- OG
- Reading
- all checks consistent
- File
- 19800415.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DAO – 16 | 19 | 16E | 342 | 13E | 9 | |
| 2 | BKI – 45 | 13 | 22E | 336 | 19E | 9 | |
| 3 | ? – 2 | 24 | 83W | 81 | 86W | - | |
| 4 | BKI – 6 | -17 | 15E | 343 | 12E | 3.5 | |
| 5 | AKK – 1 | -27 | 20E | 338 | 17E | - | |
| 6 | HKX – 3 | -20 | 41W | 39 | 44W | 3.5 | |
| 7 | HKI – 24 | -29 | 24W | 22 | 27W | 12 | |
| 8 | EKC – 99 | -9 | 15W | 13 | 18W | 14 | |
| 9 | BKI – 20 | -32 | 11W | 9 | 14W | 5.5 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.