Daily Sunspot Evaluation
Observation Sheet Thursday, 21 April 1966
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)
- 4
- Number of spots (f)
- 34
- Relative number (R)
- 74
- Observer
- HıE
- Reading
- all checks consistent
- File
- 19660421.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | D – 16 | 19 | 37E | 60 | |||
| 2 | ? – 4 | 27 | 68E | 29 | |||
| 3 | J – 3 | 22 | 40W | 137 | |||
| 4 | C – 11 | 23 | 31W | 128 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.