Daily Sunspot Evaluation
Observation Sheet Sunday, 18 August 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)
- 24
- Relative number (R)
- 64
- Observer
- HM
- Reading
- all checks consistent
- File
- 19740818.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | -14 | 20E | 257 | |||
| 2 | D – 8 | -17 | 62W | 339 | |||
| 3 | J – 2 | -3 | 67W | 344 | |||
| 4 | D – 13 | 10 | 49W | 326 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.