Daily Sunspot Evaluation
Observation Sheet Saturday, 20 March 1971
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)
- 36
- Relative number (R)
- 86
- Observer
- MA
- Reading
- all checks consistent
- File
- 19710320.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | H – 1 | -9 | 52E | 126 | |||
| 2 | C – 8 | -15 | 26E | 152 | |||
| 3 | D – 13 | -6 | 60W | 238 | |||
| 4 | C – 13 | -5 | 35W | 213 | |||
| 5 | J – 1 | 18 | 63W | 241 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.