Daily Sunspot Evaluation
Observation Sheet Monday, 18 April 1960
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)
- 5
- Number of spots (f)
- 74
- Relative number (R)
- 124
- Observer
- BG
- Reading
- all checks consistent
- File
- 19600418.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | D – 18 | 25 | 28E | ||||
| 2 | A – 3 | 20 | 8E | ||||
| 3 | C – 17 | 11 | 15E | ||||
| 4 | E – 28 | -10 | 28W | ||||
| 5 | C – 8 | 11 | 64W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.