Daily Sunspot Evaluation
Observation Sheet Tuesday, 20 May 1958
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)
- 10
- Number of spots (f)
- 59
- Relative number (R)
- 159
- Observer
- AB
- Reading
- all checks consistent
- File
- 19580520.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | E – 19 | 40 | 10E | ||||
| 2 | H – 6 | 21 | 41E | ||||
| 3 | J – 1 | 18 | 61E | ||||
| 4 | J – 1 | -24 | 1E | ||||
| 5 | H – 1 | -25 | 22W | ||||
| 6 | B – 5 | -20 | 58W | ||||
| 7 | ? – 6 | -19 | 74W | ||||
| 8 | G – 4 | -7 | 11W | ||||
| 9 | B – 5 | 18 | 55W | ||||
| 10 | D – 11 | 24 | 15W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.