Daily Sunspot Evaluation
Observation Sheet Friday, 20 May 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)
- 57
- Relative number (R)
- 107
- Observer
- ET
- Reading
- all checks consistent
- File
- 19600520.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | C – 6 | 18 | 8E | ||||
| 2 | C – 4 | 14 | 67E | ||||
| 3 | B – 2 | -2 | 21E | ||||
| 4 | F – 40 | -12 | 3W | ||||
| 5 | H – 5 | 5 | 31W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.