Daily Sunspot Evaluation
Observation Sheet Thursday, 18 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)
- 27
- Relative number (R)
- 67
- Observer
- HM
- Reading
- all checks consistent
- File
- 19740718.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | C – 10 | -14 | 33E | 294 | |||
| 2 | D – 15 | -11 | 12W | 339 | |||
| 3 | A – 1 | -14 | 24W | 351 | |||
| 4 | H – 1 | -8 | 49W | 16 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.