Daily Sunspot Evaluation
Observation Sheet Friday, 21 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)
- 8
- Number of spots (f)
- 59
- Relative number (R)
- 139
- Observer
- FA
- Reading
- all checks consistent
- File
- 19780421.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | D – 18 | 22 | 18E | 188 | 16E | ||
| 2 | D – 11 | 17 | 20E | 186 | 18E | ||
| 3 | J – 3 | -19 | 40E | 166 | 38E | ||
| 4 | J – 2 | -29 | 18E | 188 | 16E | ||
| 5 | D – 8 | -29 | 02E | 204 | 00 | ||
| 6 | J – 1 | -45 | 35W | 241 | 37W | ||
| 7 | ? – 9 | 14 | 73W | 278 | 75W | ||
| 8 | B – 7 | 12 | 59W | 263 | 52W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.