Daily Sunspot Evaluation
Observation Sheet Tuesday, 20 April 1993
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)
- 7
- Number of spots (f)
- 73
- Relative number (R)
- 143
- Observer
- HE
- Reading
- all checks consistent
- File
- 19930420.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | AX – 1 | 9 | 10W | 271 | 10W | - | 98 |
| 2 | CRO – 7 | 5 | 23E | 238 | 23E | 4 | 96 |
| 3 | DAC – 25 | 11 | 32E | 229 | 32E | 9 | 93 |
| 4 | AX – 1 | -12 | 20W | 281 | 20W | - | 99 |
| 5 | CRO – 5 | -6 | 19W | 280 | 19W | 4.5 | 94 |
| 6 | DRS – 14 | -14 | 11E | 250 | 11E | 7.5 | 97 |
| 7 | CAR – 20 | -14 | 52E | 209 | 52E | 12.5 | 92 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.