Daily Sunspot Evaluation
Observation Sheet Thursday, 28 July 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)
- 8
- Number of spots (f)
- 40
- Relative number (R)
- 120
- Observer
- FY
- Reading
- all checks consistent
- File
- 19600728.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | 28 | 23E | ||||
| 2 | H – 29 | 9 | 30E | ||||
| 3 | A – 1 | 7 | 70E | ||||
| 4 | J – 1 | -9 | 15W | ||||
| 5 | A – 1 | -18 | 20W | ||||
| 6 | A – 2 | -4 | 36W | ||||
| 7 | ? – 4 | -9 | 75W | ||||
| 8 | J – 1 | 25 | 73W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.