Daily Sunspot Evaluation
Observation Sheet Tuesday, 4 April 1961
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)
- 36
- Relative number (R)
- 106
- Observer
- ET
- Reading
- all checks consistent
- File
- 19610404.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 8 | 14 | 27E | ||||
| 2 | J – 1 | -3 | 64E | ||||
| 3 | D – 10 | -16 | 8W | ||||
| 4 | B – 5 | -18 | 17W | ||||
| 5 | H – 1 | -18 | 36W | ||||
| 6 | A – 2 | -13 | 51W | ||||
| 7 | B – 9 | -8 | 20W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.