Daily Sunspot Evaluation
Observation Sheet Monday, 17 July 1972
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)
- 5
- Number of spots (f)
- 31
- Relative number (R)
- 81
- Observer
- FA
- Reading
- all checks consistent
- File
- 19720717.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 3 | 9 | 11E | 244 | |||
| 2 | C – 15 | -9 | 30E | 225 | |||
| 3 | J – 6 | -9 | 14E | 241 | |||
| 4 | C – 5 | -23 | 02W | 257 | |||
| 5 | A – 2 | -12 | 40W | 295 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.