Daily Sunspot Evaluation
Observation Sheet Friday, 7 May 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)
- 3
- Number of spots (f)
- 25
- Relative number (R)
- 55
- Observer
- HA
- Reading
- all checks consistent
- File
- 19710507.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | H – 1 | 10 | 10E | 254 | |||
| 2 | ? – 2 | 4 | 77E | 187 | |||
| 3 | F – 22 | 12 | 07W | 271 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.