Daily Sunspot Evaluation
Observation Sheet Thursday, 16 April 1959
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)
- 12
- Number of spots (f)
- 86
- Relative number (R)
- 206
- Observer
- FY
- Reading
- all checks consistent
- File
- 19590416.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 2 | 36 | 5E | ||||
| 2 | J – 1 | 17 | 11E | ||||
| 3 | B – 3 | -1 | 4E | ||||
| 4 | J – 5 | 11 | 20E | ||||
| 5 | A – 1 | 17 | 32E | ||||
| 6 | C – 13 | -10 | 12W | ||||
| 7 | E – 28 | -16 | 28W | ||||
| 8 | G – 3 | 0 | 50W | ||||
| 9 | ? – 1 | 12 | 88W | ||||
| 10 | A – 2 | 12 | 71W | ||||
| 11 | J – 7 | 10 | 35W | ||||
| 12 | E – 20 | 26 | 16W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.