Daily Sunspot Evaluation
Observation Sheet Monday, 18 April 1966
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)
- 1
- Number of spots (f)
- 15
- Relative number (R)
- 25
- Observer
- SB
- Reading
- all checks consistent
- File
- 19660418.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | E – 15 | 24 | 5E | 131 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.