Daily Sunspot Evaluation
Observation Sheet Thursday, 21 July 1955
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)
- 1
- Number of spots (f)
- 6
- Relative number (R)
- 16
- Observer
- FY
- Reading
- all checks consistent
- File
- 19550721.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | C – 6 | 0.86 | 242 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.