Daily Sunspot Evaluation
Observation Sheet Tuesday, 18 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)
- 26
- Relative number (R)
- 76
- Observer
- ED
- Reading
- all checks consistent
- File
- 19720718.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 2 | 11 | 08E | 233 | |||
| 2 | C – 17 | -10 | 17E | 224 | |||
| 3 | J – 4 | -10 | 02E | 239 | |||
| 4 | A – 1 | -23 | 18W | 259 | |||
| 5 | J – 2 | 9 | 03W | 244 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.