Daily Sunspot Evaluation
Observation Sheet Thursday, 28 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)
- 45
- Relative number (R)
- 95
- Observer
- FY
- Reading
- all checks consistent
- File
- 19600428.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | E – 20 | -4 | 28E | ||||
| 2 | B – 4 | -17 | 42W | ||||
| 3 | J – 1 | -12 | 32W | ||||
| 4 | D – 5 | 5 | 15W | ||||
| 5 | C – 15 | 11 | 7W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.