Daily Sunspot Evaluation
Observation Sheet Monday, 18 April 1977
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)
- 3
- Number of spots (f)
- 15
- Relative number (R)
- 45
- Observer
- FA
- Reading
- all checks consistent
- File
- 19770418.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 3 | -20 | 09E | 16 | 05E | ||
| 2 | D – 9 | -20 | 01W | 24 | 03W | ||
| 3 | A – 3 | -26 | 34W | 59 | 36W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.