Daily Sunspot Evaluation
Observation Sheet Friday, 28 April 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)
- 20
- Relative number (R)
- 80
- Observer
- HM
- Reading
- all checks consistent
- File
- 19720428.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 2 | 7 | 04E | 227 | |||
| 2 | J – 1 | -13 | 45W | 276 | |||
| 3 | E – 10 | 3 | 70W | 301 | |||
| 4 | H – 3 | 17 | 20W | 251 | |||
| 5 | J – 1 | 4 | 06W | 237 | |||
| 6 | A – 3 | 17 | 12W | 243 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.