Daily Sunspot Evaluation
Observation Sheet Thursday, 20 April 1978
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)
- 50
- Relative number (R)
- 140
- Observer
- FA
- Reading
- all checks consistent
- File
- 19780420.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | D – 11 | 22 | 32E | 188 | 29E | ||
| 2 | H – 6 | 17 | 34E | 186 | 31E | ||
| 3 | J – 4 | -19 | 54E | 166 | 51E | ||
| 4 | J – 1 | -29 | 32E | 188 | 29E | ||
| 5 | C – 8 | -29 | 17E | 203 | 14E | ||
| 6 | J – 1 | -44 | 21W | 241 | 24W | ||
| 7 | J – 6 | 12 | 76W | 296 | 79W | ||
| 8 | C – 9 | 16 | 60W | 280 | 63W | ||
| 9 | A – 4 | 18 | 42W | 262 | 45W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.