Daily Sunspot Evaluation
Observation Sheet Sunday, 20 August 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)
- 8
- Number of spots (f)
- 35
- Relative number (R)
- 115
- Observer
- HM
- Reading
- counts consistent, some coordinates doubtful
- File
- 19720820.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 2 | 8 | 43E | 152 ⚠ | |||
| 2 | A – 1 | 9 | 54E | 111 | |||
| 3 | D – 7 | -4 | 56E | 109 | |||
| 4 | A – 1 | -14 | 75E | 90 | |||
| 5 | H – 7 | -24 | 02W | 167 | |||
| 6 | C – 10 | -11 | 17W | 182 | |||
| 7 | A – 1 | -10 | 76W | 241 | |||
| 8 | ? – 6 | 15 | 76W | 241 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.