Daily Sunspot Evaluation
Observation Sheet Sunday, 17 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)
- 26
- Relative number (R)
- 56
- Observer
- GT
- Reading
- all checks consistent
- File
- 19770417.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 4 | -22 | 21E | 16 | 19E | ||
| 2 | D – 17 | -20 | 11E | 26 | 9E | ||
| 3 | B – 5 | -25 | 23W | 60 | 25W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.