Daily Sunspot Evaluation
Observation Sheet Tuesday, 21 March 1961
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)
- 7
- Relative number (R)
- 47
- Observer
- BG
- Reading
- all checks consistent
- File
- 19610321.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 3 | 8 | 2E | ||||
| 2 | H – 1 | 9 | 61E | ||||
| 3 | ? – 2 | 8 | 79E | ||||
| 4 | A – 1 | 4 | 29EW |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.