Daily Sunspot Evaluation
Observation Sheet Friday, 20 April 1990
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)
- —
- Number of spots (f)
- —
- Relative number (R)
- —
- Observer
- YK
- Reading
- reading could not be verified
- File
- 19900420.jpg
Sunspot groups
The table of this sheet could not be read reliably (multiple). See the drawing for the groups.