Daily Sunspot Evaluation
Observation Sheet Saturday, 20 May 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)
- 6
- Number of spots (f)
- 85
- Relative number (R)
- 145
- Observer
- HM
- Reading
- all checks consistent
- File
- 19720520.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | H – 15 | 14 | 03E | 298 | |||
| 2 | F – 41 | -14 | 03E | 298 | |||
| 3 | A – 2 | -14 | 08W | 309 | |||
| 4 | A – 3 | -8 | 19W | 320 | |||
| 5 | C – 22 | -5 | 29W | 330 | |||
| 6 | J – 2 | -8 | 70W | 11 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.