Daily Sunspot Evaluation
Observation Sheet Thursday, 18 May 1967
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)
- 7
- Number of spots (f)
- 50
- Relative number (R)
- 120
- Observer
- SM
- Reading
- all checks consistent
- File
- 19670518.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 1 | 25 | 78E | 244 | |||
| 2 | C – 12 | -12 | 37E | 285 | |||
| 3 | C – 12 | -18 | 41E | 278 | |||
| 4 | A – 3 | -14 | 12E | 310 | |||
| 5 | C – 19 | -14 | 15W | 337 | |||
| 6 | A – 1 | 14 | 6W | 328 | |||
| 7 | H – 2 | 27 | 7W | 329 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.