Daily Sunspot Evaluation
Observation Sheet Thursday, 25 July 1974
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)
- 4
- Number of spots (f)
- 42
- Relative number (R)
- 82
- Observer
- HM
- Reading
- all checks consistent
- File
- 19740725.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | -17 | 70E | 164 | |||
| 2 | H – 16 | -9 | 24E | 210 | |||
| 3 | D – 23 | -16 | 13W | 247 | |||
| 4 | J – 2 | -13 | 63W | 297 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.