Daily Sunspot Evaluation
Observation Sheet Sunday, 21 April 1968
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)
- 7
- Relative number (R)
- 57
- Observer
- SM
- Reading
- all checks consistent
- File
- 19680421.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | R – 2 | 15 | 22E | 149 | |||
| 2 | J – 1 | -11 | 13W | 182 | |||
| 3 | J – 1 | 26 | 82W | 251 | |||
| 4 | B – 2 | 19 | 31W | 200 | |||
| 5 | J – 1 | 32 | 52W | 221 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.